diff --git a/README.md b/README.md
index 80472242ec562dfa9385ef4d047a742d3f2ec730..072def5bf5ab6bdb23b5ae2e9802660f69c5ec4c 100644
--- a/README.md
+++ b/README.md
@@ -10,7 +10,7 @@ pinned: false
 
 # Global Marine Foundation Data Agent
 
-Current UI release: **v4.6.19**.
+Current UI release: **v4.6.20**.
 
 
 ## v3.4.0 稳定性重构（第一阶段）
diff --git a/VERSION b/VERSION
index 6ee1bd81050822d000a79a767c29d0722ecd0cc2..77217322951bdf2fd5615c671a4f64b304db054a 100644
--- a/VERSION
+++ b/VERSION
@@ -1 +1 @@
-4.6.19
+4.6.20
diff --git a/codex_harness.py b/codex_harness.py
index 0c40b01a06c0be20a8728fc95bf4dc8de788196d..a309086d4855a4f0ab6a23bf858f72d62b597b88 100644
--- a/codex_harness.py
+++ b/codex_harness.py
@@ -12,6 +12,8 @@ from dataclasses import dataclass
 class CodexResult:
     final_response: str
     finish_reason: str = "completed"
+    tool_names: tuple[str, ...] = ()
+    tool_events: tuple[str, ...] = ()
 
 
 class CodexHarness:
@@ -171,7 +173,7 @@ class CodexHarness:
         result = getattr(marine_mcp, short)(**args)
         return CodexHarness._jsonable(result)
 
-    def _request(self, body: dict) -> dict:
+    def _request(self, body: dict, session_id: str) -> dict:
         request = urllib.request.Request(
             self.base_url + "/responses",
             data=json.dumps(body, ensure_ascii=False).encode("utf-8"),
@@ -181,7 +183,7 @@ class CodexHarness:
                 "Content-Type": "application/json",
                 "Accept": "application/json",
                 "User-Agent": "Global-Marine-Foundation/4.5",
-                "x-opencode-session": str(getattr(self, "_session_id", uuid.uuid4())),
+                "x-opencode-session": str(session_id),
             },
         )
         try:
@@ -222,7 +224,7 @@ class CodexHarness:
     def run(self, prompt, session_id=None):
         if not self.api_key:
             raise RuntimeError("OPENCODE_GO_API_KEY is not configured")
-        self._session_id = str(session_id or uuid.uuid4())
+        request_session_id = str(session_id or uuid.uuid4())
         full_prompt = (self.system_prompt + "\n\n" + prompt).strip()
         tools = self._tools()
         payload = self._request({
@@ -230,7 +232,9 @@ class CodexHarness:
             "input": full_prompt,
             "tools": tools,
             "tool_choice": "auto",
-        })
+        }, request_session_id)
+        tool_names = []
+        tool_events = []
 
         # Responses can contain multiple tool calls.  Execute them locally,
         # then continue the same Responses conversation until text is final.
@@ -240,10 +244,18 @@ class CodexHarness:
                 break
             outputs = []
             for call in calls:
+                if call["name"] not in tool_names:
+                    tool_names.append(call["name"])
                 try:
                     value = self._run_tool(call["name"], call["arguments"])
                 except Exception as exc:
                     value = {"status": "error", "detail": str(exc)[:1000]}
+                if len(tool_events)<40:
+                    tool_events.append(json.dumps({
+                        "name":call["name"],
+                        "arguments":call["arguments"],
+                        "result":value,
+                    },ensure_ascii=False,default=str)[:12000])
                 outputs.append({
                     "type": "function_call_output",
                     "call_id": call["call_id"],
@@ -256,11 +268,11 @@ class CodexHarness:
                 "tools": tools,
                 "tool_choice": "auto",
             }
-            payload = self._request(next_body)
+            payload = self._request(next_body, request_session_id)
         else:
             raise RuntimeError("OpenCode Go tool loop exceeded 8 rounds")
 
         answer = self._text(payload)
         if not answer:
             raise RuntimeError("OpenCode Go returned no text: " + json.dumps(payload, ensure_ascii=False)[:1200])
-        return CodexResult(final_response=answer)
+        return CodexResult(final_response=answer, tool_names=tuple(tool_names), tool_events=tuple(tool_events))
diff --git a/codex_native_harness.py b/codex_native_harness.py
index 9ad85feb63a31024751d3ae48be60df4c8c484e2..4add4c921b056defb716ac5be27a9a8f092130dc 100644
--- a/codex_native_harness.py
+++ b/codex_native_harness.py
@@ -9,6 +9,7 @@ from __future__ import annotations
 
 import json
 import os
+import re
 import shutil
 import subprocess
 import uuid
@@ -20,6 +21,8 @@ from typing import Any
 class CodexResult:
     final_response: str
     finish_reason: str = "completed"
+    tool_names: tuple[str, ...] = ()
+    tool_events: tuple[str, ...] = ()
 
 
 def _text_from_value(value: Any) -> str:
@@ -52,6 +55,27 @@ def _event_text(event: dict[str, Any]) -> str:
     return ""
 
 
+_MARINE_TOOL_RE = re.compile(r"\bmcp_marine_[A-Za-z0-9_]+\b")
+
+def _tool_names_from_event(event: dict[str, Any]) -> list[str]:
+    if not isinstance(event, dict):
+        return []
+    event_type=str(event.get("type") or "").lower()
+    item=event.get("item") if isinstance(event.get("item"),dict) else {}
+    item_type=str(item.get("type") or "").lower()
+    tool_shaped=(
+        any(token in event_type for token in ("tool","mcp","function"))
+        or any(token in item_type for token in ("tool","mcp","function"))
+    )
+    if not tool_shaped:
+        return []
+    try:
+        raw=json.dumps(event,ensure_ascii=False,default=str)
+    except Exception:
+        raw=str(event)
+    return list(dict.fromkeys(_MARINE_TOOL_RE.findall(raw)))
+
+
 class CodexNativeHarness:
     """Run the official Codex CLI with the configured MCP server."""
 
@@ -142,6 +166,8 @@ class CodexNativeHarness:
             raise RuntimeError(f"无法启动官方 Codex CLI: {exc}") from exc
 
         candidates: list[str] = []
+        tool_names: list[str] = []
+        tool_events: list[str] = []
         for line in (completed.stdout or "").splitlines():
             raw = line.strip()
             if not raw:
@@ -154,6 +180,16 @@ class CodexNativeHarness:
                 text = _event_text(event)
                 if text:
                     candidates.append(text)
+                names=_tool_names_from_event(event)
+                if names:
+                    for name in names:
+                        if name not in tool_names:
+                            tool_names.append(name)
+                    if len(tool_events)<40:
+                        try:
+                            tool_events.append(json.dumps(event,ensure_ascii=False,default=str)[:12000])
+                        except Exception:
+                            tool_events.append(str(event)[:12000])
 
         if completed.returncode != 0:
             stderr_detail = (completed.stderr or "").strip()[-1200:]
@@ -172,4 +208,4 @@ class CodexNativeHarness:
         answer = candidates[-1].strip() if candidates else ""
         if not answer:
             raise RuntimeError("官方 Codex CLI 没有返回最终文本")
-        return CodexResult(final_response=answer)
+        return CodexResult(final_response=answer, tool_names=tuple(tool_names), tool_events=tuple(tool_events))
diff --git a/services/chat_runtime.py b/services/chat_runtime.py
index 358575a425ce380cb5ba8533fbfc75e53d99a6c7..6623e9ba35993e976d82875db9929e410808f8b6 100644
--- a/services/chat_runtime.py
+++ b/services/chat_runtime.py
@@ -535,11 +535,30 @@ async def harness_stream_chat(tid,prompt):
         tid,
         USER_SYSTEM,
     )
+    history_context=""
+    try:
+        history_context=_format_recent_thread_history(
+            tid,
+            limit=12,
+            max_chars=24000,
+        )
+    except Exception:
+        history_context=""
 
     harness_prompt=(
         "[APPLICATION_CONTEXT]\n"
         + app_context
         + "\n[/APPLICATION_CONTEXT]\n\n"
+        + (
+            "[PRIOR_CONVERSATION_HISTORY]\n"
+            + history_context
+            + "\n[/PRIOR_CONVERSATION_HISTORY]\n\n"
+            + "[HISTORY_INSTRUCTION]\n"
+            + "Use prior conversation only to resolve references and continuity. "
+              "The current user message has priority over older content.\n"
+            + "[/HISTORY_INSTRUCTION]\n\n"
+            if history_context else ""
+        )
         + "[CURRENT_USER_MESSAGE]\n"
         + prompt
         + "\n[/CURRENT_USER_MESSAGE]"
@@ -591,6 +610,23 @@ async def harness_stream_chat(tid,prompt):
                 "Codex Harness 没有返回有效文本。"
             )
 
+        tool_names=tuple(getattr(result,"tool_names",()) or ())
+        tool_events=tuple(getattr(result,"tool_events",()) or ())
+        export_tool_completed=any(
+            name.endswith("marine_export")
+            or name.endswith("marine_export_range")
+            or name.endswith("_export")
+            for name in tool_names
+        )
+        export_error=_ocean_export_execution_error(
+            prompt,
+            export_tool_completed=export_tool_completed,
+            tool_result_text="\n".join(tool_events),
+            final_answer=final_answer,
+        )
+        if export_error:
+            raise RuntimeError(export_error)
+
         log.info(
             "Codex Harness completed: "
             "thread=%s model=%s reason=%s uploads=%s",
@@ -628,12 +664,11 @@ async def harness_stream_chat(tid,prompt):
             len(pending_uploads),
         )
 
+        public_error=_public_error(str(exc))
         yield out(
             "error",
             {
-                "text":
-                    "Codex Harness 调用失败："
-                    + str(exc)[:500],
+                "text":public_error,
                 "stage":"harness",
             },
         )
@@ -655,14 +690,23 @@ def _is_runtime_info_prompt(prompt: str) -> bool:
 
 
 def _is_marine_health_prompt(prompt: str) -> bool:
-    """Recognize a live Marine API status question without invoking the model."""
-    text = str(prompt or "").strip().lower()
-    health_terms = (
+    """Recognize actual connectivity/status questions, not any domain mention."""
+    text=str(prompt or "").strip().lower()
+    if not text:
+        return False
+    explicit_phrases=(
         "海洋数据服务器连接", "检查海洋数据服务器", "数据服务器连接",
-        "三个数据域", "三个域是否在线", "ocean、tuna、squid",
-        "ocean, tuna, squid", "marine health", "marine server health",
+        "三个域是否在线", "三个数据域是否在线", "marine health",
+        "marine server health",
+    )
+    if any(term in text for term in explicit_phrases):
+        return True
+    status_terms=(
+        "在线","离线","连接","连通","状态","健康","可用","不可用",
+        "正常吗","是否正常","reachable","online","offline","status","health",
     )
-    return any(term in text for term in health_terms)
+    domain_terms=("ocean","tuna","squid","marine","数据服务器","数据域")
+    return any(x in text for x in status_terms) and any(x in text for x in domain_terms)
 
 
 def _is_fisheries_inventory_prompt(prompt: str) -> bool:
@@ -795,55 +839,81 @@ async def _direct_fisheries_inventory_answer(prompt: str) -> str:
 
 
 async def _direct_marine_health_answer():
-    """Query the configured Marine API directly for a deterministic status answer."""
-    httpx_module = globals().get("httpx")
+    """Query live domain status without inferring unavailable states."""
+    httpx_module=globals().get("httpx")
     if httpx_module is None:
         try:
             import httpx as httpx_module
         except Exception as exc:
             return f"海洋数据服务器连接检查失败：HTTP 客户端不可用（{exc}）"
-    base = str(globals().get("MARINE_API_URL") or "").rstrip("/")
+    base=str(globals().get("MARINE_API_URL") or "").rstrip("/")
     if not base:
         return "海洋数据服务器未配置 MARINE_API_URL。"
 
-    candidates = [f"{base}/health"]
-    # HF may expose the school API below the app's /marine reverse-proxy path.
+    def status_label(value):
+        if isinstance(value,dict):
+            value=value.get("status",value.get("online",value.get("available")))
+        if value is True:
+            return "在线"
+        if value is False:
+            return "离线/不可用"
+        low=str(value or "").strip().lower()
+        if low in {"ok","online","ready","available","healthy","true","1"}:
+            return "在线"
+        if low in {"offline","down","unavailable","error","false","0"}:
+            return "离线/不可用"
+        return "未确认"
+
+    candidates=[f"{base}/domains"]
     if not base.endswith("/marine"):
-        candidates.append(f"{base}/marine/health")
-
-    last_error = ""
-    async with httpx_module.AsyncClient(timeout=12.0, follow_redirects=True) as client:
+        candidates.append(f"{base}/marine/domains")
+    last_error=""
+    async with httpx_module.AsyncClient(timeout=12.0,follow_redirects=True) as client:
         for url in candidates:
             try:
-                response = await client.get(url)
+                response=await client.get(url)
+                if not response.is_success:
+                    last_error=f"HTTP {response.status_code}"
+                    continue
+                payload=response.json()
+                domain_payload=payload.get("domains") if isinstance(payload,dict) else None
+                if not isinstance(domain_payload,(dict,list)):
+                    domain_payload=payload if isinstance(payload,(dict,list)) else None
+                labels={key:"未确认" for key in ("ocean","tuna","squid")}
+                if isinstance(domain_payload,dict):
+                    for key in labels:
+                        if key in domain_payload:
+                            labels[key]=status_label(domain_payload.get(key))
+                elif isinstance(domain_payload,list):
+                    present={str(x.get("name") if isinstance(x,dict) else x).lower() for x in domain_payload}
+                    for key in labels:
+                        labels[key]="在线" if key in present else "未确认"
+                return (
+                    "Marine 数据服务已连通。\n"
+                    f"- Ocean：{labels['ocean']}\n"
+                    f"- Tuna：{labels['tuna']}\n"
+                    f"- Squid：{labels['squid']}\n"
+                    "未确认表示服务器响应中没有足够状态字段，平台不会把它自动当成在线。"
+                )
+            except Exception as exc:
+                last_error=str(exc)
+
+    # Fallback health only proves the API is reachable, not that each domain is online.
+    health_urls=[f"{base}/health"]
+    if not base.endswith("/marine"):
+        health_urls.append(f"{base}/marine/health")
+    async with httpx_module.AsyncClient(timeout=12.0,follow_redirects=True) as client:
+        for url in health_urls:
+            try:
+                response=await client.get(url)
                 if response.is_success:
-                    payload = response.json()
-                    domains = payload.get("domains") if isinstance(payload, dict) else None
-                    labels = {
-                        "ocean": "在线",
-                        "tuna": "在线",
-                        "squid": "在线",
-                    }
-                    if isinstance(domains, dict):
-                        for key in labels:
-                            value = domains.get(key)
-                            if isinstance(value, dict):
-                                value = value.get("status") or value.get("online")
-                            if value in (False, "offline", "未连接", "不可用"):
-                                labels[key] = "离线/不可用"
-                    elif isinstance(domains, list):
-                        for key in labels:
-                            if key not in {str(item).lower() for item in domains}:
-                                labels[key] = "未在健康响应中列出"
                     return (
-                        "海洋数据服务器连接正常。\n"
-                        f"- Ocean：{labels['ocean']}\n"
-                        f"- Tuna：{labels['tuna']}\n"
-                        f"- Squid：{labels['squid']}"
+                        "Marine API 可以连接，但当前未取得 Ocean/Tuna/Squid 的逐域状态。"
+                        "请在“设置 → 系统健康”中重新检测详细状态。"
                     )
-                last_error = f"HTTP {response.status_code}"
+                last_error=f"HTTP {response.status_code}"
             except Exception as exc:
-                last_error = str(exc)
+                last_error=str(exc)
     return f"海洋数据服务器连接检查失败：{last_error[:240]}"
 
 
diff --git a/static/js/app.js b/static/js/app.js
index 3c9ef3ade19ba9a507fa62fd0a4cabe328e08ff1..981c8585ec24925035dd7cec4ed2daef6940e589 100644
--- a/static/js/app.js
+++ b/static/js/app.js
@@ -340,7 +340,7 @@ function persist(role,text,meta=""){
   if(role==="assistant"&&meta!=="error")refreshSessionSummary(x,true);
   setUpdated(x);save();hist()
 }
-function historyPayload(x,limit=8){
+function historyPayload(x,limit=12){
   if(!x)return[];
   const items=[];
   for(const m of (x.messages||[])){
diff --git a/tests/test_agent_reliability_v4620.py b/tests/test_agent_reliability_v4620.py
new file mode 100644
index 0000000000000000000000000000000000000000..e0f82b084ad227c135bbf37e9fdaa940c5b6426b
--- /dev/null
+++ b/tests/test_agent_reliability_v4620.py
@@ -0,0 +1,51 @@
+from pathlib import Path
+ROOT=Path(__file__).resolve().parents[1]
+
+def test_version():
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
+
+def test_harness_receives_recent_conversation_history():
+    py=(ROOT/"services/chat_runtime.py").read_text(encoding="utf-8")
+    assert "_format_recent_thread_history(" in py
+    assert "[PRIOR_CONVERSATION_HISTORY]" in py
+    assert "max_chars=24000" in py
+
+def test_health_intent_does_not_trigger_on_domain_names_alone():
+    py=(ROOT/"services/chat_runtime.py").read_text(encoding="utf-8")
+    block=py[py.index("def _is_marine_health_prompt"):py.index("def _is_fisheries_inventory_prompt")]
+    assert '"ocean、tuna、squid"' not in block
+    assert "status_terms" in block
+    assert "domain_terms" in block
+
+def test_direct_health_never_defaults_all_domains_online():
+    py=(ROOT/"services/chat_runtime.py").read_text(encoding="utf-8")
+    block=py[py.index("async def _direct_marine_health_answer"):py.index("def _is_explicit_new_data_query")]
+    assert 'labels={key:"未确认"' in block
+    assert '/domains' in block
+    assert "平台不会把它自动当成在线" in block
+
+def test_native_harness_preserves_tool_evidence():
+    py=(ROOT/"codex_native_harness.py").read_text(encoding="utf-8")
+    assert "tool_names: tuple[str, ...]" in py
+    assert "_tool_names_from_event" in py
+    assert "tool_events=tuple(tool_events)" in py
+
+def test_harness_export_is_fail_closed():
+    py=(ROOT/"services/chat_runtime.py").read_text(encoding="utf-8")
+    assert 'tool_names=tuple(getattr(result,"tool_names"' in py
+    assert "export_tool_completed=any(" in py
+    assert "_ocean_export_execution_error(" in py
+
+def test_adapter_does_not_store_shared_mutable_session_id():
+    py=(ROOT/"codex_harness.py").read_text(encoding="utf-8")
+    assert "request_session_id" in py
+    assert "self._session_id =" not in py
+
+def test_harness_errors_are_sanitized():
+    py=(ROOT/"services/chat_runtime.py").read_text(encoding="utf-8")
+    assert "public_error=_public_error(str(exc))" in py
+    assert '"text":public_error' in py
+
+def test_frontend_sends_more_recent_context():
+    js=(ROOT/"static/js/app.js").read_text(encoding="utf-8")
+    assert "function historyPayload(x,limit=12)" in js
diff --git a/tests/test_api_entry_preflight_v456.py b/tests/test_api_entry_preflight_v456.py
index 26d5a4f800b3b7ed4ac12ae341878299a4d8bc0d..b05ec91dbe3860ac2d05a1497c40fdbf5a9db782 100644
--- a/tests/test_api_entry_preflight_v456.py
+++ b/tests/test_api_entry_preflight_v456.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_guard_is_before_auth_and_dispatch():
     chat=(ROOT/"routes"/"chat.py").read_text(encoding="utf-8")
diff --git a/tests/test_chat_lifecycle_progress_v393.py b/tests/test_chat_lifecycle_progress_v393.py
index a4b34b352db330b99e8df88829e30c8017301693..63af83b1516279c2ac0e10b923c9f32dc7a96501 100644
--- a/tests/test_chat_lifecycle_progress_v393.py
+++ b/tests/test_chat_lifecycle_progress_v393.py
@@ -3,7 +3,7 @@ import pathlib
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version_393():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_frontend_lifecycle_progress():
     js=(ROOT/"static"/"js"/"app.js").read_text(encoding="utf-8")
diff --git a/tests/test_clarification_ui_v454.py b/tests/test_clarification_ui_v454.py
index 61d40aaa3785b49ef963ac0f9de56c1904ba4b85..2a4afd8e6987562a9757275c3f4c5c5970c92de0 100644
--- a/tests/test_clarification_ui_v454.py
+++ b/tests/test_clarification_ui_v454.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_missing_date_reuses_canonical_region_bbox():
     rt=(ROOT/"services"/"chat_runtime.py").read_text(encoding="utf-8")
diff --git a/tests/test_classification_cleanup_v466.py b/tests/test_classification_cleanup_v466.py
index b9bad2ae56e20c8ed437f633525a73634a6829be..680b7cc92093b42d9976ef6bee5d1d76fdca8108 100644
--- a/tests/test_classification_cleanup_v466.py
+++ b/tests/test_classification_cleanup_v466.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_seaaroundus_alias():
     py=(ROOT/"sidebar_catalog.py").read_text(encoding="utf-8")
diff --git a/tests/test_context_and_multitask_finalize_v451.py b/tests/test_context_and_multitask_finalize_v451.py
index 3ad1789d56139b545b03798b95c43d2a91bad884..793128580c6522ea827c1c93e62b6e6eb97bbca1 100644
--- a/tests/test_context_and_multitask_finalize_v451.py
+++ b/tests/test_context_and_multitask_finalize_v451.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_new_query_slot_reset():
     rt=(ROOT/"services"/"chat_runtime.py").read_text(encoding="utf-8")
diff --git a/tests/test_conversation_summary_v4613.py b/tests/test_conversation_summary_v4613.py
index 578c3a526827dfa8f6c678beb7bb87dcb16cbf2a..bd4d6fccd8f0e50e0f34b9e5aaf29664d7012af3 100644
--- a/tests/test_conversation_summary_v4613.py
+++ b/tests/test_conversation_summary_v4613.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_frontend_auto_summary_and_manual_override():
     js=(ROOT/"static/js/app.js").read_text(encoding="utf-8")
diff --git a/tests/test_download_host_authorization_v460.py b/tests/test_download_host_authorization_v460.py
index fff96c79ff62a2751ef6b403bf48a1ea03d6e608..137adec061cbe57bfa41d2de7ce886830e66a79b 100644
--- a/tests/test_download_host_authorization_v460.py
+++ b/tests/test_download_host_authorization_v460.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_batch_url_authorization_helper_exists():
     py=(ROOT/"routes"/"downloads.py").read_text(encoding="utf-8")
diff --git a/tests/test_download_opfs_fallback_v459.py b/tests/test_download_opfs_fallback_v459.py
index 836e141fee357614b777545ad5bf983cdac826ef..4ad6a9eb823b6921e8e82cecd281c8bb6db92dbd 100644
--- a/tests/test_download_opfs_fallback_v459.py
+++ b/tests/test_download_opfs_fallback_v459.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_opfs_is_probed_not_assumed():
     js=(ROOT/"static"/"js"/"app.js").read_text(encoding="utf-8")
diff --git a/tests/test_download_overlay_v4618.py b/tests/test_download_overlay_v4618.py
index 5619499c59e4a6f4658c144f12db26dba2a36a78..2d4fda5093af25ad05ef1f9b2eec5ddc4ead5b95 100644
--- a/tests/test_download_overlay_v4618.py
+++ b/tests/test_download_overlay_v4618.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.18"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_native_download_handoff_finishes_overlay():
     js=(ROOT/"static/js/app.js").read_text(encoding="utf-8")
diff --git a/tests/test_download_progress_v391.py b/tests/test_download_progress_v391.py
index 2ca8d68745867504c7d01ba629eada8c150d1bc7..84a50f02e01a2909469d71d11143a1609a1d1f3b 100644
--- a/tests/test_download_progress_v391.py
+++ b/tests/test_download_progress_v391.py
@@ -3,7 +3,7 @@ import pathlib
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version_391():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_p1_label_removed():
     js=(ROOT/"static"/"js"/"app.js").read_text(encoding="utf-8")
diff --git a/tests/test_download_resilience_v422.py b/tests/test_download_resilience_v422.py
index a9196d1018a9f9ed7d461fd3dc5ae0b7d97b84b5..e3ad9517bde094994e123aef9b85a76e9fb95b1e 100644
--- a/tests/test_download_resilience_v422.py
+++ b/tests/test_download_resilience_v422.py
@@ -3,7 +3,7 @@ import pathlib
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_refresh_route_registered():
     t=(ROOT/"routes"/"ocean_batch.py").read_text(encoding="utf-8")
diff --git a/tests/test_frontend_preflight_v457.py b/tests/test_frontend_preflight_v457.py
index 1320647bfff82df9f8b051208427849d894d1886..af674baf232e3dea26d6de6ccfee34a35fd97355 100644
--- a/tests/test_frontend_preflight_v457.py
+++ b/tests/test_frontend_preflight_v457.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_frontend_preflight_exists_before_progress():
     js=(ROOT/"static"/"js"/"app.js").read_text(encoding="utf-8")
diff --git a/tests/test_history_dedupe_recent_summary_v4614.py b/tests/test_history_dedupe_recent_summary_v4614.py
index 9ce1028f1f9cadb2b058b0b43c41861715f36e0c..b185ae2ac00a04a10097a2033db2d8a73ab31067 100644
--- a/tests/test_history_dedupe_recent_summary_v4614.py
+++ b/tests/test_history_dedupe_recent_summary_v4614.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_frontend_dedupe_and_merge():
     js=(ROOT/"static/js/app.js").read_text(encoding="utf-8")
diff --git a/tests/test_history_sidebar_v373.py b/tests/test_history_sidebar_v373.py
index d58c2e736316247ab9f7338371c690a50edf040c..2c270cc5faca392c52c35c9e7b4b6c879bb20b27 100644
--- a/tests/test_history_sidebar_v373.py
+++ b/tests/test_history_sidebar_v373.py
@@ -3,7 +3,7 @@ import pathlib
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version_373():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_project_history_backend():
     route=(ROOT/"routes"/"project_package.py").read_text(encoding="utf-8")
diff --git a/tests/test_large_download_jobs_v400.py b/tests/test_large_download_jobs_v400.py
index 889a2f5f6dad3c1cb492163be075d326b9fabaad..55dc0ae507b4247813227d575f454c1f76d4b084 100644
--- a/tests/test_large_download_jobs_v400.py
+++ b/tests/test_large_download_jobs_v400.py
@@ -3,7 +3,7 @@ import pathlib
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version_400():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_download_job_backend():
     route=(ROOT/"routes"/"downloads.py").read_text(encoding="utf-8")
diff --git a/tests/test_manual_tasks_v469.py b/tests/test_manual_tasks_v469.py
index 81d18aab5a0a925472d252c027ab6f36edb41b2f..7774dfae824358334bc7d577d93262dbee31892a 100644
--- a/tests/test_manual_tasks_v469.py
+++ b/tests/test_manual_tasks_v469.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_manual_task_backend_exists():
     service=(ROOT/"services/manual_tasks.py").read_text(encoding="utf-8")
@@ -27,4 +27,4 @@ def test_frontend_new_task_controls():
     assert "标记完成" in js
     assert "重新打开" in js
     assert "manual-delete" in js
-    assert "账号服务器持久化（可跨设备）" in js
+    assert "账号同步：" in js and "可跨设备同步" in js and "服务器会话" in js
diff --git a/tests/test_merged_health_v433.py b/tests/test_merged_health_v433.py
index e4d6ddb41af86dc2ff864f12e82bef125fbd065c..f9d007fb0ea103f1cae2348a68ecc024d8588377 100644
--- a/tests/test_merged_health_v433.py
+++ b/tests/test_merged_health_v433.py
@@ -3,7 +3,7 @@ from services.ocean_batch import parse_ocean_batch_request
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_merged_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.9"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_ocean_month_batch_survives_merge():
     p=parse_ocean_batch_request("查询 2002 年 8 月西北太平洋的 SST 数据，并导出为 CSV 文件供我下载")
diff --git a/tests/test_multitask_observability_v442.py b/tests/test_multitask_observability_v442.py
index febf3a83c601fe5b9e18a4d3b48303460ab5b4a2..f9cbff5c8727ce8cd2e75d1359192878e465cd4d 100644
--- a/tests/test_multitask_observability_v442.py
+++ b/tests/test_multitask_observability_v442.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_frontend_sends_multitask_trace_headers():
     js=(ROOT/"static"/"js"/"app.js").read_text(encoding="utf-8")
diff --git a/tests/test_multitask_sse_finalize_v452.py b/tests/test_multitask_sse_finalize_v452.py
index 863e4a683dab55e983bd53c91aff53c8726651a4..31efb8f92a2b6fd29197239a0da26d9382f91144 100644
--- a/tests/test_multitask_sse_finalize_v452.py
+++ b/tests/test_multitask_sse_finalize_v452.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_parallel_sse_uses_real_blank_line_separator():
     js=(ROOT/"static"/"js"/"app.js").read_text(encoding="utf-8")
diff --git a/tests/test_noaa_ramldb_roles_v465.py b/tests/test_noaa_ramldb_roles_v465.py
index dc4f94db98c33e8e96f47d0e53683c91acb95e66..c570444c3c3bac86f3ef0a060a57cfcdd47039b3 100644
--- a/tests/test_noaa_ramldb_roles_v465.py
+++ b/tests/test_noaa_ramldb_roles_v465.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_noaa_and_ramldb_aliases():
     py=(ROOT/"sidebar_catalog.py").read_text(encoding="utf-8")
diff --git a/tests/test_ocean_batch_downloads_v420.py b/tests/test_ocean_batch_downloads_v420.py
index 53da6d506971d37dfe82bcf0d7cf97a4c5455007..b3aa8970b890803aaf916d4435b41c66e67566b9 100644
--- a/tests/test_ocean_batch_downloads_v420.py
+++ b/tests/test_ocean_batch_downloads_v420.py
@@ -3,7 +3,7 @@ import pathlib
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version_420():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_manifest_has_filename_and_sizes():
     svc=(ROOT/"services"/"ocean_batch.py").read_text(encoding="utf-8")
@@ -17,13 +17,13 @@ def test_frontend_has_one_click_batch_download():
     assert "function startOceanBatchDownloadAll" in js
     assert "function runOceanBatchDownloadQueue" in js
     assert "function waitManagedDownloadStatus" in js
-    assert "下载全部" in js
+    assert "打包 ZIP 下载" in js and "逐个下载" in js
     assert "查看文件" in js
 
 def test_batch_download_uses_managed_range_jobs():
     js=(ROOT/"static"/"js"/"app.js").read_text(encoding="utf-8")
     assert 'j("/api/download/jobs"' in js
-    assert "triggerBrowserSave(child.stream_url" in js
+    assert "triggerBrowserSave(job.stream_url" in js
     assert "resume_supported" in js
     assert "30 秒无新字节" in js
 
diff --git a/tests/test_ocean_batch_routing_v421.py b/tests/test_ocean_batch_routing_v421.py
index f3939dc93ac8e3dec12840c48d2afbd0c57a022c..7342097591c1fe5039b3ee0ab4db35c2f24bbbde 100644
--- a/tests/test_ocean_batch_routing_v421.py
+++ b/tests/test_ocean_batch_routing_v421.py
@@ -4,7 +4,7 @@ from services.ocean_batch import parse_ocean_batch_request
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version_421():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_exact_user_month_query_routes_to_batch():
     p=parse_ocean_batch_request("查询 2002 年 8 月西北太平洋的 SST 数据，并导出为 CSV 文件供我下载")
diff --git a/tests/test_ocean_batch_v410.py b/tests/test_ocean_batch_v410.py
index a529c104cb1a11ee161064b136d13daaebf3f549..52077a09216f971b98cdcf37e06a8b597c634874 100644
--- a/tests/test_ocean_batch_v410.py
+++ b/tests/test_ocean_batch_v410.py
@@ -4,7 +4,7 @@ from services.ocean_batch import parse_ocean_batch_request
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version_410():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_month_three_variable_batch_plan():
     p=parse_ocean_batch_request("查询并导出 2002 年 8 月西北太平洋 120°E–140°E、20°N–40°N 的 SST、SSH、CHL 数据，并打包下载")
diff --git a/tests/test_ocean_batch_zip_manifest_v4619.py b/tests/test_ocean_batch_zip_manifest_v4619.py
index 7c3f5385bfb1b4b73b89da34f746247421b47761..9be8b899d5703b791a8b6ed16772c5d16891edcb 100644
--- a/tests/test_ocean_batch_zip_manifest_v4619.py
+++ b/tests/test_ocean_batch_zip_manifest_v4619.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.19"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_zip_backend_routes_exist():
     py=(ROOT/"routes/ocean_batch.py").read_text(encoding="utf-8")
diff --git a/tests/test_ocean_date_default_v453.py b/tests/test_ocean_date_default_v453.py
index f7955ba2d1b48074a318ba21d131db1bb1cea9fe..7b5d5d06448cb06c86a36a3a2f1736b67df45509 100644
--- a/tests/test_ocean_date_default_v453.py
+++ b/tests/test_ocean_date_default_v453.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_missing_date_never_defaults_to_today():
     rt=(ROOT/"services"/"chat_runtime.py").read_text(encoding="utf-8")
diff --git a/tests/test_ocean_download_url_base_v462.py b/tests/test_ocean_download_url_base_v462.py
index 5464d43cff1478f6ae43e50c90c4d42170ab6d4d..83c732e664e52695e11c4591b2061b77737bf3fa 100644
--- a/tests/test_ocean_download_url_base_v462.py
+++ b/tests/test_ocean_download_url_base_v462.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_generic_public_base_not_used():
     py=(ROOT/"services"/"ocean_batch.py").read_text(encoding="utf-8")
diff --git a/tests/test_p0_finish_v380.py b/tests/test_p0_finish_v380.py
index a416a0d9d64fe28a89316bb140056c806ead8367..32541035f0130afd5dc80c6cf19e2cf6fd5dd71a 100644
--- a/tests/test_p0_finish_v380.py
+++ b/tests/test_p0_finish_v380.py
@@ -3,7 +3,7 @@ import pathlib, re, subprocess, shutil
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version_380():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_chat_runtime_extracted():
     ui=(ROOT/"ui_server.py").read_text(encoding="utf-8")
diff --git a/tests/test_p0_phase2_v371.py b/tests/test_p0_phase2_v371.py
index 8f062445cec7e929356ffb12245ce3ec1f936831..16c2c8f8cd8a310a02fbed839169b9a6ef2be883 100644
--- a/tests/test_p0_phase2_v371.py
+++ b/tests/test_p0_phase2_v371.py
@@ -3,7 +3,7 @@ import pathlib
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_frontend_feature_modules_exist():
     html=(ROOT/"app.html").read_text(encoding="utf-8")
diff --git a/tests/test_p0_phase3_v372.py b/tests/test_p0_phase3_v372.py
index 5681a29f56992d891bdccfeb2c0c7c50ced62d02..550586f98adfdd91780543fbdbfd11a2f9778fd6 100644
--- a/tests/test_p0_phase3_v372.py
+++ b/tests/test_p0_phase3_v372.py
@@ -3,7 +3,7 @@ import pathlib
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version_372():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_route_modules_exist():
     for name in ("datasets.py","user_state.py","project_package.py","data_health.py"):
diff --git a/tests/test_platform_reliability_v450.py b/tests/test_platform_reliability_v450.py
index 52a23718bbf97b8d045a8f6a8458132b89832239..1650e16c246920355d9edfbb1d62dcd47a27ee3c 100644
--- a/tests/test_platform_reliability_v450.py
+++ b/tests/test_platform_reliability_v450.py
@@ -6,7 +6,7 @@ from services.ocean_batch import parse_ocean_batch_request
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_squid_center_uses_repository_membership():
     js=(ROOT/"static"/"js"/"app.js").read_text(encoding="utf-8")
@@ -15,7 +15,7 @@ def test_squid_center_uses_repository_membership():
     assert "file_count_by_repository" in api
     assert "domains.includes(domain)" in js
     assert "squid_file_count" in js
-    assert "实时仓库文件树口径" in js
+    assert "Hugging Face main 实时文件树" in js
 
 def test_single_ocean_export_forces_managed_proxy():
     js=(ROOT/"static"/"js"/"app.js").read_text(encoding="utf-8")
diff --git a/tests/test_product_finish_v4615.py b/tests/test_product_finish_v4615.py
index 03c81d93cfac9a6c85b9a5b310f0a39b5f9e9719..398d204fee7b6ab7f73f4c74e7c31e1d791772af 100644
--- a/tests/test_product_finish_v4615.py
+++ b/tests/test_product_finish_v4615.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_system_health_is_settings_embedded_and_modular():
     app=(ROOT/"static/js/app.js").read_text(encoding="utf-8")
diff --git a/tests/test_project_package_download_v4617.py b/tests/test_project_package_download_v4617.py
index f83ac8ad605f28467b505814ed7b4fbefd759203..f3d814bb48b1f8d2025e0826198d865d5cf80559 100644
--- a/tests/test_project_package_download_v4617.py
+++ b/tests/test_project_package_download_v4617.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.17"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_project_package_download_is_capability_url():
     py=(ROOT/"routes/project_package.py").read_text(encoding="utf-8")
@@ -21,4 +21,4 @@ def test_same_origin_download_probes_before_native_save():
 def test_project_download_button_explains_browser_handoff():
     js=(ROOT/"static/js/project-package.js").read_text(encoding="utf-8")
     assert "正在交给浏览器" in js
-    assert "已交给浏览器下载" in js
+    assert "已交给浏览器；实际完成状态请看浏览器下载栏" in js
diff --git a/tests/test_quality_center_v362.py b/tests/test_quality_center_v362.py
index dfd731efa01bab86289167ef304237be9a7916d2..bbde0bf73dd06abcbf2af09a02bbe309e786371d 100644
--- a/tests/test_quality_center_v362.py
+++ b/tests/test_quality_center_v362.py
@@ -3,7 +3,7 @@ import pathlib
 ROOT = pathlib.Path(__file__).resolve().parents[1]
 
 def test_version_371():
-    assert (ROOT / "VERSION").read_text(encoding="utf-8").strip() == "4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_native_health_backend():
     text = (ROOT / "routes" / "data_health.py").read_text(encoding="utf-8")
diff --git a/tests/test_quality_trust_v361.py b/tests/test_quality_trust_v361.py
index b8e12a77791e53a8a2ff3e575e12e94dfdf096c6..0f847e084157cd5d1eda571eef5375194f6e6dd0 100644
--- a/tests/test_quality_trust_v361.py
+++ b/tests/test_quality_trust_v361.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version_current():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_quality_confidence_is_now_native_api_metric():
     text=(ROOT/"routes"/"data_health.py").read_text(encoding="utf-8")
diff --git a/tests/test_reference_cleanup_v468.py b/tests/test_reference_cleanup_v468.py
index b7cec447ffaa87d9b193ce9500192dc6276e5586..963316aef1dbb16cd9b91446e97dbb51c2499cec 100644
--- a/tests/test_reference_cleanup_v468.py
+++ b/tests/test_reference_cleanup_v468.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_reference_and_reproducibility_are_auxiliary():
     py=(ROOT/"routes"/"datasets.py").read_text(encoding="utf-8")
diff --git a/tests/test_release_stability.py b/tests/test_release_stability.py
index 3a1fff92be0ef890cbfa7b8cb0da93da777c0589..831df81406eda6aee8a1011a964c53235400287b 100644
--- a/tests/test_release_stability.py
+++ b/tests/test_release_stability.py
@@ -7,7 +7,7 @@ def test_version_is_single_source():
     version = (ROOT / "VERSION").read_text(encoding="utf-8").strip()
     ui = (ROOT / "ui_server.py").read_text(encoding="utf-8")
     html = (ROOT / "app.html").read_text(encoding="utf-8")
-    assert version == "4.6.15"
+    assert version == '4.6.20'
     assert 'with_name("VERSION")' in ui
     assert "__APP_VERSION__" in html
 
diff --git a/tests/test_resumable_batch_download_v458.py b/tests/test_resumable_batch_download_v458.py
index d397c7cb58b93c251779fad7a5988c12411e3e2d..7b05b3119fe12c4e0af0595a1f4abf22b253e0a1 100644
--- a/tests/test_resumable_batch_download_v458.py
+++ b/tests/test_resumable_batch_download_v458.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_network_loss_pauses_not_fails_all():
     js=(ROOT/"static"/"js"/"app.js").read_text(encoding="utf-8")
diff --git a/tests/test_route_region_clarification_v455.py b/tests/test_route_region_clarification_v455.py
index ed1afd60d6e70e01763fed3006fe2c1f6a58791d..9cece65009a35791e35e5f30c4133c7fd0e57219 100644
--- a/tests/test_route_region_clarification_v455.py
+++ b/tests/test_route_region_clarification_v455.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_route_guard_exists_before_agent_dispatch():
     chat=(ROOT/"routes"/"chat.py").read_text(encoding="utf-8")
diff --git a/tests/test_runtime_hotfix_v376.py b/tests/test_runtime_hotfix_v376.py
index 6043a15e9e2523c49969b53339fa06b1fc853a6b..5d2711e51bf67cbf9a43e81bdd0ecef35b4975eb 100644
--- a/tests/test_runtime_hotfix_v376.py
+++ b/tests/test_runtime_hotfix_v376.py
@@ -3,7 +3,7 @@ import pathlib
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version_376():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_no_stray_async_before_sidebar_toggle():
     js=(ROOT/"static"/"js"/"app.js").read_text(encoding="utf-8")
diff --git a/tests/test_sidebar_collapse_v374.py b/tests/test_sidebar_collapse_v374.py
index fc05abffbffe79c3313060a958484384b9742e82..6c6730a93b59e85254d61ce2acad1c57409dff8f 100644
--- a/tests/test_sidebar_collapse_v374.py
+++ b/tests/test_sidebar_collapse_v374.py
@@ -3,7 +3,7 @@ import pathlib
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version_374():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_sidebar_toggle_markup():
     html=(ROOT/"app.html").read_text(encoding="utf-8")
diff --git a/tests/test_sidebar_partial_collapse_v375.py b/tests/test_sidebar_partial_collapse_v375.py
index e59ed57493b451dceec9001c11b20938854e65ad..410872757956a813d1d03e8137e6745c4cd3a34c 100644
--- a/tests/test_sidebar_partial_collapse_v375.py
+++ b/tests/test_sidebar_partial_collapse_v375.py
@@ -3,7 +3,7 @@ import pathlib
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version_375():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_sidebar_order_and_groups():
     html=(ROOT/"app.html").read_text(encoding="utf-8")
diff --git a/tests/test_smart_progress_avatar_sync_v441.py b/tests/test_smart_progress_avatar_sync_v441.py
index 86aa0edea40dd88ba73edd31aa67ecb762e7888e..101384a3a75b4dc506cbb56469a2359e22fb3d26 100644
--- a/tests/test_smart_progress_avatar_sync_v441.py
+++ b/tests/test_smart_progress_avatar_sync_v441.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_simple_chat_hides_progress_until_needed():
     js=(ROOT/"static"/"js"/"app.js").read_text(encoding="utf-8")
diff --git a/tests/test_source_mapping_roles_v464.py b/tests/test_source_mapping_roles_v464.py
index 0919d790a022dac998a3cbebcdcfed81b8b143c4..45dc907d87d28d4e87e91c440b8d2886ada00ce7 100644
--- a/tests/test_source_mapping_roles_v464.py
+++ b/tests/test_source_mapping_roles_v464.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_new_source_mappings():
     py=(ROOT/"sidebar_catalog.py").read_text(encoding="utf-8")
diff --git a/tests/test_squid_finalize_v467.py b/tests/test_squid_finalize_v467.py
index edb26ac152e09576da6c2db006dff2ca29af1d45..617ab287b0e0caa9bb4e0a4f1d39206e80abbf73 100644
--- a/tests/test_squid_finalize_v467.py
+++ b/tests/test_squid_finalize_v467.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_ccamlr_and_ommastrephidae_mappings():
     py=(ROOT/"sidebar_catalog.py").read_text(encoding="utf-8")
diff --git a/tests/test_sse_heartbeat_v401.py b/tests/test_sse_heartbeat_v401.py
index 49ec7976e209ae49be7b028581f47203207616ad..2e94d8758af3b291e2100ce122a29d86a57983ca 100644
--- a/tests/test_sse_heartbeat_v401.py
+++ b/tests/test_sse_heartbeat_v401.py
@@ -3,7 +3,7 @@ import pathlib
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version_401():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_chat_has_independent_heartbeat_wrapper():
     route=(ROOT/"routes"/"chat.py").read_text(encoding="utf-8")
diff --git a/tests/test_system_health_fix_v4616.py b/tests/test_system_health_fix_v4616.py
index 3986ac0f07bd6697c2dc8afebc2a979fb077b041..717d72f77e49cb116e5afc53ebb70d3e0959282b 100644
--- a/tests/test_system_health_fix_v4616.py
+++ b/tests/test_system_health_fix_v4616.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.16"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_system_health_request_is_typed():
     py=(ROOT/"routes/system_health.py").read_text(encoding="utf-8")
diff --git a/tests/test_task_layout_v470.py b/tests/test_task_layout_v470.py
index 242c4ff2ea92168f6ca44a6784bb9831ae0e6fd5..1ae3db2649f948ef941cfe68e60363b5c26b0741 100644
--- a/tests/test_task_layout_v470.py
+++ b/tests/test_task_layout_v470.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT = Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip() == '4.6.15'
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_manual_task_layout_classes_present():
     js = (ROOT/'static/js/app.js').read_text(encoding='utf-8')
diff --git a/tests/test_task_priority_deadline_v4611.py b/tests/test_task_priority_deadline_v4611.py
index b6de9330795d95cb7be8fe497f2d908d8984f867..45c0315fffd4f38af849e233c49997980d2bf5f9 100644
--- a/tests/test_task_priority_deadline_v4611.py
+++ b/tests/test_task_priority_deadline_v4611.py
@@ -1,6 +1,6 @@
 from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
-def test_version(): assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.15'
+def test_version(): assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 def test_manual_fields():
     s=(ROOT/'services/manual_tasks.py').read_text(encoding='utf-8')
     assert 'VALID_PRIORITIES' in s and 'due_at' in s and 'priority' in s
diff --git a/tests/test_task_productization_v4612.py b/tests/test_task_productization_v4612.py
index 2071e9c09b133336ccdb2abf408f3bcf72781001..2a9bce22caeb85c6311b0e389f0a04ab6cbfa496 100644
--- a/tests/test_task_productization_v4612.py
+++ b/tests/test_task_productization_v4612.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_task_endpoint_softens_memory_error_and_adds_project_history():
     py=(ROOT/"ui_server.py").read_text(encoding="utf-8")
@@ -24,7 +24,7 @@ def test_task_ui_has_sorting_quick_filters_and_overdue():
 
 def test_memory_error_is_collapsed_not_raw_banner():
     js=(ROOT/"static/js/app.js").read_text(encoding="utf-8")
-    assert "<details class=\\"service-row task-remote-note\\">" in js
+    assert '<details class="service-row task-remote-note">' in js
     assert "task-tech-detail" in js
 
 def test_workspace_sync_already_covers_sessions_and_settings():
diff --git a/tests/test_ui_avatar_multitask_v440.py b/tests/test_ui_avatar_multitask_v440.py
index d7b0dcc1c9e81576aa5ea4c4ae49db2b0e486bda..1b61c06d7e64813bd344b68598203642504e4893 100644
--- a/tests/test_ui_avatar_multitask_v440.py
+++ b/tests/test_ui_avatar_multitask_v440.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_assistant_avatar_removed_user_avatar_customizable():
     js=(ROOT/"static"/"js"/"app.js").read_text(encoding="utf-8")
diff --git a/tests/test_unclassified_inventory_v463.py b/tests/test_unclassified_inventory_v463.py
index 05827f218d7edf25c6e029a72616738bfcae2403..289480bd12a6cbd3f34177e523cd3324ab901f7d 100644
--- a/tests/test_unclassified_inventory_v463.py
+++ b/tests/test_unclassified_inventory_v463.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_backend_unique_classification_and_route():
     py=(ROOT/"routes"/"datasets.py").read_text(encoding="utf-8")
diff --git a/tests/test_unified_download_manager_v392.py b/tests/test_unified_download_manager_v392.py
index 9292a287384ac142bb2fbf56fedff77eccfe8d79..44e8a34d6dba04add12137bd3ad44b027d95d4c9 100644
--- a/tests/test_unified_download_manager_v392.py
+++ b/tests/test_unified_download_manager_v392.py
@@ -3,7 +3,7 @@ import pathlib
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version_392():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_download_proxy_route_registered():
     route=(ROOT/"routes"/"downloads.py").read_text(encoding="utf-8")
diff --git a/tests/test_unified_query_v390.py b/tests/test_unified_query_v390.py
index 8cec9828ef62a495029c74737564a1623584b7e1..86856f74c10d53d4ff771d51de23153ccd675980 100644
--- a/tests/test_unified_query_v390.py
+++ b/tests/test_unified_query_v390.py
@@ -4,7 +4,7 @@ from services.unified_query import plan_unified_query
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version_390():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_joint_squid_environment_plan():
     p=plan_unified_query("查询 2002 年 8 月西北太平洋柔鱼记录，并匹配 SST、SSH、CHL")
diff --git a/tests/test_upstream_refresh_retry_v461.py b/tests/test_upstream_refresh_retry_v461.py
index 784d0da420e19796dd62f1738333078aaa2b54fc..72bf93fb849cb88b1785cb05aaa828f7b572f4e9 100644
--- a/tests/test_upstream_refresh_retry_v461.py
+++ b/tests/test_upstream_refresh_retry_v461.py
@@ -2,7 +2,7 @@ from pathlib import Path
 ROOT=Path(__file__).resolve().parents[1]
 
 def test_version():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_probe_returns_status_and_rejects_dead_url():
     py=(ROOT/"routes"/"downloads.py").read_text(encoding="utf-8")
diff --git a/tests/test_v381_navigation_ocean_intent.py b/tests/test_v381_navigation_ocean_intent.py
index 4a6ed7f5878377287db9379c8144b112718b790a..12626f2578178002be53178c4ee735583f7904db 100644
--- a/tests/test_v381_navigation_ocean_intent.py
+++ b/tests/test_v381_navigation_ocean_intent.py
@@ -3,7 +3,7 @@ import pathlib, ast
 ROOT=pathlib.Path(__file__).resolve().parents[1]
 
 def test_version_381():
-    assert (ROOT/"VERSION").read_text(encoding="utf-8").strip()=="4.6.15"
+    assert (ROOT/'VERSION').read_text(encoding='utf-8').strip()=='4.6.20'
 
 def test_recent_conversation_switches_to_chat():
     js=(ROOT/"static"/"js"/"app.js").read_text(encoding="utf-8")
diff --git a/ui_server.py b/ui_server.py
index dda8a6d665524dfc25cffe3cb1bd045990587907..1f56b953504e04b4986c5fa09b0b77934999ec7c 100644
--- a/ui_server.py
+++ b/ui_server.py
@@ -2727,12 +2727,23 @@ def _public_error(text):
     raw=(text or "未知错误").strip()
     low=raw.lower()
     if "402" in low or "insufficient balance" in low:
-        return "智谱 ZAI API 返回 402：账户余额不足。"
+        return "模型服务当前余额不足，暂时无法完成请求。"
     if "401" in low or "unauthorized" in low:
-        return "智谱 ZAI API 认证失败（401）。请检查 ZAI_API_KEY 配置。"
+        return "模型服务认证失败，请联系管理员检查服务配置。"
     if "429" in low or "rate limit" in low:
-        return "智谱 ZAI API 当前触发限流（429），请稍后重试。"
-    return raw
+        return "模型服务当前请求过多，请稍后重试。"
+    if "timeout" in low or "超时" in raw:
+        return "Agent 本次处理超时，请稍后重试；如果是大任务，建议拆成更小的请求。"
+    if any(token in low for token in (
+        "official codex cli","codex harness","stderr:","stdout:",
+        "opencode go api","connection failed","traceback","api key",
+    )):
+        return "Agent 运行时暂时无法完成请求，请稍后重试；技术详情已记录到服务器日志。"
+    if "ocean 导出工具未实际执行" in raw:
+        return raw
+    if len(raw)<=260 and not any(x in low for x in ("exception","stack","/home/user/","/tmp/")):
+        return raw
+    return "Agent 暂时无法完成请求，请稍后重试。"
 
 
 def _ocean_export_execution_error(