Accept proof-bound email separator romanization

production.py

@@ -5010,6 +5010,13 @@ def _network_fragment_mixed_render_pattern(spoken_fragment: str) -> str | None:
             for alias, canonical_reading in _SIMPLIFIED_NETWORK_SYMBOL_READINGS.items()
             if canonical_reading == canonical
         )
+        if canonical == "小老鼠":
+            # Pinned Whisper decoders can romanize the audibly correct email
+            # separator. These aliases remain one atom in this exact,
+            # planner-range-bound lattice; the surrounding local part, domain,
+            # TLD, ordering, and conservative identifier boundaries are still
+            # mandatory and cannot be inferred from prose.
+            spoken_variants.update({"xiaolaoshu", "xiaolaoshui"})
         spoken_variants.add(ascii_atom)
         variants = sorted(
             {

tests/test_production.py

@@ -1649,6 +1649,8 @@ def test_local_network_fragment_accepts_exact_mixed_long_form_email_domain():
     (
         "若要更換導覽場次請寄信到tour.help@islandmuseum.tw",
         "若要更換導覽場次請寄信到tour.help小老鼠islandmuseum.tw",
+        "若要更換導覽場次請寄信到tour.helpXiaolaoshuislandmuseum.tw",
+        "若要更換導覽場次請寄信到tour.helpXiaolaoshuiislandmuseum.tw",
     ),
 )
 def test_atomic_email_chunk_accepts_only_exact_proof_bound_mixed_render(transcript):
@@ -1680,6 +1682,54 @@ def test_atomic_email_chunk_rejects_mixed_render_mutation():
     assert evidence.passed is False
 
 
+@pytest.mark.parametrize(
+    "transcript",
+    (
+        "若要更換導覽場次請寄信到tour.helpXiaolaoshuiislandmuseum.com",
+        "若要更換導覽場次請寄信到tour.helpXiaolaoshuiislandmuseurn.tw",
+        "若要更換導覽場次請寄信到tour.helpXiaolaoshuiislandmuseum.t",
+        "若要更換導覽場次請寄信到tour.helpXiaolaoshuiislandmuseum.twz",
+        "若要更換導覽場次請寄信到tour.helpXiaolaoshuiislandmuseum.tw/x",
+        "若要更換導覽場次請寄信到tour.helpXiaolaoshuiislandmuseum.tw?x",
+        "若要更換導覽場次請寄信到tour.helpXiaolaoshuiislandmuseum.tw#x",
+        "若要更換導覽場次請寄信到xtour.helpXiaolaoshuiislandmuseum.tw",
+        "若要更換導覽場次請寄信到tour.helpxXiaolaoshuiislandmuseum.tw",
+        "若要更換導覽場次請寄信到tour.helpXiaolaoshuixislandmuseum.tw",
+    ),
+)
+def test_atomic_email_alias_rejects_content_and_boundary_mutations(transcript):
+    raw = "若要更換導覽場次，請寄信到 tour.help@islandmuseum.tw。"
+    target = normalize_spoken_forms(raw)
+    spec = plan_generation_chunks(raw, target)[0]
+
+    evidence = canonicalize_asr_network_fragments(
+        transcript,
+        target,
+        spec.network_fragment_proofs,
+    )
+
+    assert evidence.protected_range_count == 1
+    assert evidence.passed is False
+
+
+def test_atomic_email_alias_cannot_borrow_proof_from_url_path():
+    raw = "若要更換導覽場次，請寄信到 tour.help@islandmuseum.tw。"
+    target = normalize_spoken_forms(raw)
+    spec = plan_generation_chunks(raw, target)[0]
+
+    evidence = canonicalize_asr_network_fragments(
+        (
+            "若要更換導覽場次請寄信到"
+            "https://example.tw/tour.helpXiaolaoshuiislandmuseum.tw"
+        ),
+        target,
+        spec.network_fragment_proofs,
+    )
+
+    assert evidence.protected_range_count == 1
+    assert evidence.passed is False
+
+
 @pytest.mark.parametrize(
     "transcript",
     (