source/docs/operations/handover.md

# Completed training and profiling campaign

**Current state, 2026-09-17 09:22 UTC:** training and evaluation are complete.
All trainers, final validation jobs and profiling jobs exited **0**. No optimizer
updates remain active. Both Spark GPUs are idle. Keep all resumable checkpoints;
do not resume training as part of this completed request.

The frozen selected **Qwen3-4B-Instruct-2507 decision scorer** retains Spark B
step **1,500** weights through the identical expanded-branch step **0** artifact.
All 506 trainable tensors match exactly. The latest expanded **159**, Spark A
**4,765** and Spark B **2,000** states were freshly validated; none passed the
fixed promotion threshold. Five candidates were eligible; selection froze before
reserved evaluation at **08:09:51 UTC**. The expanded step-159 result is a
post-selection diagnostic and does not replace the winner.

The [final report, tables and charts](../../results/20260917-wrapup/profile-report/report.md)
records **92.90% vs 84.48%** base-verifier accuracy on 2,042 test decisions and
**72.92% vs 70.31%** on 768 Social IQA holdout decisions. The 95% paired bootstrap
accuracy differences are +8.42 pp [6.85, 9.89] and +2.60 pp [0.13, 5.34]. The
separate 320-example comparison scores selected/base-verifier/joint-label at
89.06% / 80.94% / 86.25%. Current selected inference is slower in every measured
workload: long-state four-choice medians are 3.710 / 3.177 / 0.818 seconds.
These are FP32 local warm measurements on an idle Spark, without prefix caching.
See [profiling-protocol.md](../research/profiling-protocol.md) and [next-steps.md](../research/next-steps.md).

## Completed runs and remaining services

All run IDs below are relative to `/home/andy/ai/opensysone/runs` on the named host.

- GX10 fleet `20260916T194403396250Z-fleet`: coordinator, evaluation and local
  harness checks **exit 0**, completed **09:20:23 UTC**. Execution source is
  **`07f10e791061a679b829ed1dc5b33897e001d67d`**, frozen worktree
  `/home/andy/ai/opensysone/source/profile-07f10e7`. The original deadline remained
  **18:16:10 UTC**. `plan.before-user-wrapup.json` preserves the original selection
  schedule; the final cutoff was advanced to 08:07:30 UTC at the user's request.
- The calibrated artifact is `evaluation/model.pt` in that fleet run, SHA256
  **`e270e3da905604d97bf5a8f380ea308133403d1c4790a5c012cb1c12e9b6f348`**,
  temperature **1.745822072**, saved before test predictions. The deploy pointer
  is `/home/andy/ai/opensysone/deploy/current.json`.
- Local Jev-compatible API remains on loopback **18081**, PID **1716630**,
  source `07f10e7`, serving the calibrated model. `api_probe.json` records real
  normalized inference; `api.log` is its log. Inspect `/health`. To stop, first
  verify the PID command against fleet `state.json`, then send SIGTERM. Restart
  the recorded `api_command` using the isolated environment; no training or
  evaluation resume is needed. Serving exit status remains pending while alive.
  Hosted Jev inference still requires credentials and has not been measured.
- GUI remains on **7466**, default **Qwen3 4B · Selected**, wrapper **1674634**,
  server **1674635**, runtime `20260917T081925Z-playground-selected`, launch source
  **`00c80dd`**. Four-model real-browser checks passed. Historical snapshots remain
  selectable. See [playground.md](../usage/playground.md) for inspect/stop/restart controls;
  the active serving processes intentionally have no final exit status yet.
- Spark A `20260917T081236Z-spark-a-profile`: all three inference methods,
  **exit 0 at 09:08:39 UTC**. Spark B `20260917T081236Z-spark-b-profile`:
  expanded checkpoint 159, **exit 0 at 08:20:35 UTC**. Profiling source `07f10e7`;
  fixed protocol `20260917T081045Z-inference-profile-protocol`. All 2,812 predictions
  and 360 measured timing samples passed audit. Collector and auditor also exited.
- Final model publication watcher `20260917T023940Z-hf-final-watch` finished
  **exit 0 at 09:20:52 UTC**. Hugging Face `andyshu/opensysone` remains private;
  verified `FINAL_MODEL.json` pointer commit is
  **`2082f71beb86740f36f00b82a6eeab64b9e89b61`**. Its source archive is `6729461`.
  Supplemental profiling/checkpoint/report backup uses `PROFILE_RESULTS.json`;
  inspect `20260917T092700Z-hf-wrapup-evidence/state.json` and `exit_code` for its
  verified payload/pointer revisions. Pointers are published only after remote
  integrity checks. The earlier `20260917T092300Z-hf-wrapup-evidence` attempt
  exited 1 on a local progress-callback TypeError before upload; its receipt is
  retained. The callback was corrected before retry. No credentials or base-model
  weights belong in the archives.

Final validation source is **`18f2b39`**. Training revisions remain **`4a60423`**
(Sparks/original 4B) and **`24b8ccf`** (expanded GX10). Original/resumable snapshots,
CPU proofs and archival resume commands are in `20260917T075209Z-training-wrapup`
and `20260917T075129Z-spark-wrapup` on GX10. The former contains the final evidence
file map, selected lineage proof, completion proof and `profile-deployment` with
collected Spark outputs. The report run is `20260917T092045Z-final-profile-report`;
its generator was committed at `6729461`. Small copies are committed under
`results/20260917-wrapup`. The sections below preserve historical campaign detail;
their active-training instructions are superseded by this completed state.

**Latest continuation, 2026-09-17 07:29 UTC:** the user requested broader training
data. [training-data.md](../research/training-data.md) records the 80,765-example seven-family
mix, exact protected-split preservation, completed eight-step pilot and new GX10
campaign `20260917T072142Z-24h`. It warm-starts from Spark B's selected step 1,500
with fresh Adam, then resumes the verified pilot. GX10's original run stopped
cleanly at step 4,380, retaining best step 2,500. Both Spark 4B runs continue;
the completed 2B remains available. All **five candidates** are registered.
The expanded run passed exact 512-prediction replay, full optimizer/RNG restore
and subsequent finite updates; it reached step 15 at 07:28:58 UTC. Its data,
pilot weights and source are uploaded and verified in the existing private
Hugging Face repository. The GUI on 7466 and final-publication watcher remain up.
The earlier overnight assessment is in [next-steps.md](../research/next-steps.md).

The user assigned **GX10 and both Sparks** to this task, authorized stopping their
workloads, and requested continued experimentation without permission prompts.
SSH key authentication as `andy` works on **192.168.8.111** (spark-a / spark-d1b4)
and **192.168.8.204** (spark-b / spark-3e2a). The former Qwen serving pair was
stopped cleanly at 19:14 UTC; its files/cache and exact restoration commands are
preserved in [fleet.md](fleet.md). All three hosts run independent trials.

The original absolute final deadline remains **2026-09-17 18:16:10 UTC /
19:16:10 BST**. Every training supervisor stops by **16:00 UTC / 17:00 BST**,
leaving 2 h 16 min for selection, calibration, untouched evaluation and the local
Jev-compatible API. Never reset that deadline on recovery. Training early stopping
can finish sooner. Final evaluation and hosted Jev inference are still pending.

Read [plan.md](plan.md), [results-history.md](results-history.md) and [fleet.md](fleet.md).
The authoritative working source is `/home/andy/projects/opensysone` on GX10;
there is no hosted Git remote. Do not overwrite it with an older Mac checkout.
Operational documentation is copied to `/home/andy/ai/opensysone/gx10-reference`
on each host. Read the relevant `docs/host.md`, `docs/training.md`, `docs/spark-a.md`,
`docs/spark-b.md` and `docs/fleet.md` before changing machines.

## Active runs and source

All run IDs below are relative to `/home/andy/ai/opensysone/runs` **on that host**.
The Spark trainers launched from clean source **`4a60423`**. The expanded GX10
trainer uses clean source **`24b8ccf`** in the detached worktree
`/home/andy/ai/opensysone/source/expanded-24b8ccf`; keep that worktree for its
supervisor and recovery. The main checkout contains current documentation and
backup/verification tools. Running trainers retain their execution revision
and source hashes in their manifests. Inspect live state before
using recorded PIDs. Exit statuses of active jobs remain pending.

| Host | Trial | Campaign | Supervisor / trainer at launch |
| --- | --- | --- | --- |
| GX10 | Original 4B, stopped at 4,380; selected 2,500 | `20260916T193741Z-24h` | exited 0 / 0 |
| GX10 | Expanded 4B, LR 0.00002, seed 433, resumed pilot step 8 | `20260917T072142Z-24h` | 1630617 / 1630638 |
| spark-a | 4B, LR 0.00003, fresh optimizer then pilot resume | `20260916T194258Z-24h` | 327084 / 327116 |
| spark-b | 2B completed at step 6,000; selected step 2,000 | `20260916T193803Z-24h` | exited 0 / 0 |
| spark-b | 4B refinement, LR 0.00001, seed 432 | `20260917T023137Z-24h` | 483974 / 484001 |

Fleet coordinator: **`20260916T194403396250Z-fleet` on GX10**, PID **1630841**,
source **`24b8ccf`**, running in `waiting_for_selection` with OOM adjustment 0.
It was stopped before the fifth candidate and its explicit dataset override were
registered, then restarted. The old stop's exit 1 can remain in `exit_code` while
the new coordinator runs; current process identity/state determines liveness.
It selects the best durable candidate, then runs finalization and serves it on
GX10. The individual campaigns are `train_only=true`;
they cannot independently evaluate reserved data or publish competing deployments.

Each campaign's `training/checkpoint.pt` holds resumable optimizer/RNG state;
`training/best.pt` holds its validation-selected model. Saves occur every **250
steps or 900 seconds**, independently of 512-decision validation every 500 steps.
Patience is eight evaluations. A logged update can be newer than its checkpoint.
Three epochs are an upper bound, not a promised completed data pass.

Latest audit **2026-09-17 02:10–02:15 UTC**: GX10 step 2,570 / selected 2,500
(93.55% accuracy, 0.188640 crossfit NLL); Spark A step 2,529 / selected 2,500
(92.58%, 0.218012); Spark B 2B finished at 6,000 / selected 2,000 (89.84%,
0.255294). All logged gradients/losses are finite; peak allocations are
15.624 / 15.624 / 8.183 GiB. The 2B final correctness gate passed, worst 6.56e-7.
Small evidence is in `results/20260917-fleet-progress/`; historical startup proofs
remain in `results/20260916-fleet-setup/`. Reserved predictions remain untouched.
At 02:38 UTC, GX10/A had logged steps 2,721/2,704, with selected checkpoints
unchanged. The new Spark B campaign replayed all 512 pilot step-8 predictions
exactly, preserved full Adam/RNG state, and resumed finite updates (step 13 in
the fleet snapshot; startup proof covers 9–12). Its selected branch step 0 is
still the frozen GX10 parent. Startup checks passed; final exits remain pending.

## Evidence and selection

The fixed selection policy is **`crossfit_temperature_nll_v1`**, four source-group-
disjoint validation folds, seed 431. Each fold's temperature is fitted on the other
three; macro-family NLL is scored only on held-out validation predictions. Final
serving temperature is fitted afresh on reserved calibration after the winner is
frozen. Raw NLL and accuracy remain separately reported. No reserved calibration,
test or Social IQA predictions have selected a candidate.

This is a documented validation-driven revision: 4B step 128 scores **89.0625%**
accuracy / **0.318518** crossfit NLL, versus step 40's 87.5% / 0.359522. Raw NLL
favored step 40 because step 128 was more overconfident. The accuracy difference
alone is uncertain. Fresh step-178 validation subsequently reached **90.4297%**
accuracy / **0.303825** crossfit NLL / 0.404198 raw NLL and became the durable
best; its state and evidence passed the same fleet eligibility checks. See
`results/20260916-fleet-setup/selection-diagnostic.json`;
independent test/holdout results remain necessary.

GX10's old `20260916T185910Z-24h` stopped with a complete step-128 checkpoint;
its trainer exited **-9** during subsequent final checks after the supervisor's
30-second grace. No optimizer progress was lost. The next campaign,
`20260916T192239Z-24h`, restored all trainable weights, Adam and Python/torch/CUDA
RNG exactly, then stopped gracefully at **step 178, training exit 0**. Its explicit
`skipped_on_stop` final-check status is not a new correctness pass.
The immutable `20260916T193721Z-selection-parent` keeps that step-178 checkpoint
byte-for-byte and reselects the unchanged step-128 best weights under the new
criterion. It preserves the old raw-NLL best separately. Migration proof is in
`results/20260916-fleet-setup/selection_migration.json`. Do not restart old campaigns.

Both Spark environments passed **21,368 file hashes and 55 exact distribution
versions** against GX10. All 13 files in each pinned model were SHA-256 verified.
Spark A reproduced all 512 original 4B pilot predictions exactly before eight
finite updates; its pilot and fresh GPU/HTTP verification exited 0. Spark B passed
fresh GPU/HTTP verification,
reproduced all 512 original 2B predictions exactly, and resumed finite optimizer
updates. Spark A's long campaign also reproduced all 512 step-8 predictions
exactly, preserved all weights/Adam/RNG state, and resumed finite updates. Small proofs are in `results/20260916-fleet-setup/`. The revised source
passes **37 CPU tests**, plus the updated trained-Adam reselection integration.
These wiring and validation checks do not establish held-out generalization.

The exact A step-2,500 / B step-2,000 ensemble-reference artifacts are preserved
on GX10 in `20260917T022201Z-ensemble-reference`, outside fleet selection. The
fixed mixed ensemble's small validation NLL advantage is uncertain; see
[next-steps.md](../research/next-steps.md). This diagnostic is outside the current individual-model selection protocol.
Adoption would require an explicit protocol revision and verified implementation
before any reserved-data evaluation.

## Model, data and machine bounds

Pinned Apache-2.0 models are under `/home/andy/ai/models/opensysone`:

- `Qwen3-4B-Instruct-2507-cdbee75f`, revision
  `cdbee75f17c01a7cc42f958dc650907174af0554`: FP32, rank 8 / alpha 16,
  16.518M trainable parameters, 512-token training, exact two-pass gradients.
- `Qwen3.5-2B-15852e8c`, revision
  `15852e8c16360a2fea060d615a32b45270f8a8fc`: FP32 text decoder, rank 16 /
  alpha 32, 16.821M trainable parameters, 768-token training.

Use `/home/andy/ai/envs/opensysone/bin/python`. GX10's isolated environment reuses
existing torch/Transformers read-only; the Sparks have verified isolated copies.
Shared environments are unchanged. BF16 remains blocked by measured numerical
invariance failures. Keep the **16 GiB CUDA allocation cap**, at least **24 GiB
MemAvailable** before loading, GPU process inspection and `oom_score_adj=0`.
GX10's small existing router remains; Spark serving jobs remain stopped.
GX10 has no ConnectX; memory pools are separate. No network, swap, earlyoom,
firewall or clock configuration was changed.

Frozen data: `/home/andy/ai/opensysone/data/public-decisions-v1-20260916`.
Source-group-disjoint SNLI, BoolQ, ARC and four-choice Banking77; Social IQA is
an untrained task-family holdout. Pins/licences/hashes are in
`results/public-decisions-v1-manifest.json`. The 4B retains 40,915 train / 512
validation / 510 calibration / 2,042 test / 768 holdout; 2B retains 40,937 / 512 /
512 / 2,047 / 768. Validation IDs are identical. Exact deduplication does not
exclude semantic duplicates or pretraining contamination. No customer data.

## Inspect, stop and recover

One read-only command checks every registered candidate concurrently, including
completed candidates, with exact process identity and no model loading:

```bash
python3 scripts/fleet_status.py
python3 scripts/fleet_status.py --json
```

Use the exact active host/run from the table, or the fleet controls in
[fleet.md](fleet.md). From the project directory on the relevant host:

```bash
~/ai/envs/opensysone/bin/python scripts/campaign_status.py \
  --campaign /home/andy/ai/opensysone/runs/20260916T193741Z-24h
tail -n 5 /home/andy/ai/opensysone/runs/20260916T193741Z-24h/training/training.jsonl
```

Add `--stop` for a command-verified TERM to the recorded supervisor, orphan child
or API. Wait for exit and lock release before restarting. Training checkpoints
at a safe boundary. Do not start a second model on an occupied host. Resume a
stopped candidate into a fresh campaign on its host:

```bash
~/ai/envs/opensysone/bin/python scripts/launch_24h.py \
  --pilot /absolute/old/campaign/training --train-only \
  --training-deadline 2026-09-17T16:00:00Z \
  --deadline 2026-09-17T18:16:10Z --inference-max-tokens 1024 \
  --selection-metric crossfit_temperature_nll_v1
```

Preserve model/data/seed/rank/alpha/learning rates/batches/token limits/schedule/
epochs/two-pass configuration. The launcher restores them from the checkpoint.
Use only trusted project checkpoints. **If a candidate path changes, stop the
waiting fleet coordinator, update that candidate in its own `plan.json`, and
resume it.** Editing a plan while the coordinator is running does not reload it.
After `selection.json` exists, the winner is frozen; recovery must not reselect
after test access. Stopping the waiting coordinator does not stop the independently supervised
independently bounded training jobs; stop each campaign explicitly when needed.

## Finalization and Jev harness

The coordinator reconstructs the selected model, fits a scalar temperature on
reserved calibration, checkpoints `evaluation/model.pt`, then evaluates untouched
test/holdout against the unchanged pretrained scorer with separately fitted base
temperature and source-group uncertainty. It verifies direct inference and a real
HTTP request before publishing `/home/andy/ai/opensysone/deploy/current.json`.
Success requires fleet `exit_code=0`, complete `evaluation/metrics.json`, and
`state.json` with `api_ready=true`. Training completion alone is insufficient.
The resulting API is **http://127.0.0.1:18081/v1/systemone**, inference limit 1,024;
its PID/command remain recorded after the coordinator exits.

[jev-api.md](../usage/jev-api.md) documents local, hosted and comparison modes,
optional bearer authentication and Mac SSH tunneling. **`TYPESAFE_API_KEY` is
not configured**, so authenticated hosted Jev inference has not been tested.
Local confidence is normalized entropy, not established correctness calibration.
This produces a general-language decision scorer, not a new general-purpose chat
model. Frozen-head/generation controls, new-model prefix caching and the broader
latency matrix remain open.

## Completed runs and history

All paths below are under `/home/andy/ai/opensysone/runs/`.

| Run | Execution source | Exit / result |
| --- | --- | --- |
| `20260916T182256Z-train` | `4b25eec` | 1, chat-template return-type setup error before optimizer training; preserved |
| `20260916T182352Z-train` | `f1c9322` | 0, 2B public-data 40-step pilot |
| `20260916T183240Z-train` | `980d881` | 0, exact 512-prediction restart and step 41 |
| `20260916T183751Z-verify2b` | script SHA in manifest | 0, restored-optimizer longest-input gradients and real authenticated HTTP |
| `20260916T183823Z-train` | `ccbbe6d` | 0, selected 4B 40-step pilot |
| `20260916T185718Z-verify4b` | script SHA in manifest | 0, 4B reload, optimizer-memory, long-context and 255-choice HTTP checks |
| `20260916T155124Z` | `34a993e` | 0, original 0.5B synthetic FP32 60-step smoke |
| `20260916T155314Z` | `91019bc` | 0, exact 72-prediction restart and step 61 |
| `20260916T154714Z` | `4d6cb0f` | 1, BF16 probability-invariance failure; checkpoint preserved |
| `20260916T161253Z-precision` | staged hashes later `b9dd165` | 0, diagnostic completed; BF16 fails |
| `20260916T161355Z-precision` | `409ade4` | 0, expanded diagnosis; all BF16 variants fail |

Small raw results and checkpoint hashes are retained under `results/<run-id>`;
weights stay under `~/ai`. Original 0.5B smoke and verified prefix caching are
unchanged in `smoke_train.py`/`decision_model.py`. FP32 passed the original expanded
precision gate at worst 0.00002138; BF16 remains blocked. Synthetic results prove
wiring, not task generalization. New-model prefix caching, frozen-head/generation
controls and the larger latency matrix remain open. Fleet connectivity details
are in [fleet-scout.md](fleet-scout.md), including verified numeric SSH addresses. The current fleet allocation supersedes
its earlier serving-occupancy snapshot.

Hugging Face backup and final-publication controls: [huggingface.md](huggingface.md).


## Hugging Face publication watcher

Backup destination: [andyshu/opensysone](https://huggingface.co/andyshu/opensysone),
private, existing license metadata retained. The initial read-only credential
failed with HTTP 403; its sanitized report remains in
`results/20260917-fleet-progress/hf-initial-artifacts-publication.json`.
At 02:52 UTC the user-supplied replacement was verified as account `andyshu`,
role `write`, and saved to the existing local Hugging Face login store. Token
values are excluded from source, logs and backups. **The initial snapshot upload
completed and was verified at 02:54 UTC**, exit 0, including source and all four
checkpoint pairs. See `hf-write-auth-verified.json` and
`hf-snapshot-publication.json`. The first verified HF pointer commit is
`b213728f9acc5e009bc96704db341913d582be4c`; remote `CURRENT_SNAPSHOT.json` records
the authoritative payload/source revisions, including later documentation
refreshes. Local publication state is in
`~/ai/opensysone/runs/20260917T025300Z-hf-snapshot-publish`; immutable backup
staging remains under `~/ai/opensysone/exports`.

An independent final-publication watcher runs on GX10: PID **1427060**, source
**`35d6d8f`**, OOM adjustment 0, status `waiting_for_completion` at launch. Its
status directory is `/home/andy/ai/opensysone/runs/20260917T023940Z-hf-final-watch`;
the adjacent `.log` file records process output. Exit status remains pending.
Inspect `state.json` and `exit_code`; match the exact `state.json.command` against
`/proc/1427060/cmdline` before stopping only that watcher with SIGTERM. Restart
with the command in [huggingface.md](huggingface.md) and a new output directory.
The watcher publishes the frozen final model only after completed evaluation and
verified deployment, then checks the remote payload before updating
`FINAL_MODEL.json`. Its own deadline is 18:46:10 UTC; this does not extend training
or the original model deadline. See the launch proof for the exact command/hash.

The previous watcher (PID 1426447) was deliberately stopped, exit 1, and replaced
with the process above to remove inherited `HF_TOKEN`/`HUGGING_FACE_HUB_TOKEN`
overrides. It will read the updated write-capable stored login when final publication
begins. Changing credentials does not require
changing the training jobs, fleet plan, API or repository visibility.


## Interactive model playground — 2026-09-17

The user requested a GUI for text plus candidate answers and probabilities. It is
running on GX10 at **http://127.0.0.1:7466**, PID **1469393**, backend source **`2d0ff79`**,
OOM adjustment 0. From the Mac, run `ssh -N -L 7466:127.0.0.1:7466 gx10`, then
open **http://localhost:7466**. See [playground.md](../usage/playground.md).

Runtime: `/home/andy/ai/opensysone/runs/20260917T034059Z-playground-port7466`, also recorded
in `LAST_PLAYGROUND`. `launch.json` records the exact process command/source
hashes and `server.log` receives sanitized diagnostics. Exit status is pending
while serving. Inspect `/api/status` and match `/proc/1469393/cmdline` against
`launch.json.command` before sending SIGTERM to this process only. The documented
CLI restarts it from the fixed catalog after the old listener has stopped.

Three immutable snapshots are available: GX10 4B step 2,500, Spark A 4B step 2,500,
and Spark B 2B step 2,000. Their files/hashes and matching provenance are under
the original snapshot runtime, referenced by this runtime's `models.json`; these probabilities are explicitly uncalibrated. No
reserved evaluation examples were used for GUI testing. One backend resides at
a time; loads, scoring and unloading are serialized on a dedicated worker thread.
The 16 GiB allocation cap and memory/OOM checks remain active. This extra GUI
process shares GPU compute with training, so requests can slow optimizer steps.
Port 18081 remains reserved for final deployment; no firewall/services changed.

All seven backend tests passed. Chromium passed real inference for all three
models, return switching, clipboard JSON, input-edit staleness, duplicate options,
actual tokenizer overflow and mobile layout. Browser script/CSP errors: none.
Cold/switch example requests were 5.08–9.10 seconds; a warm main-model request
was 1.53 seconds. These are individual wiring timings, not latency percentiles
or quality estimates. Real results/screenshots and concurrency observations are
in `results/20260917-playground/`; the separate frontend fixture report is labeled
as stubbed UI testing. Training and the fleet/final-publication controllers remain
independent of this GUI.

A 45-second observation after GUI verification recorded the GX10 trainer advancing
from step 3,063 to 3,068 with finite losses/gradients, a 15.624 GiB allocation peak
and 81.3 GiB host memory available. The GUI stayed ready. This confirms continued
training during GUI operation; it does not establish zero slowdown or capture all
model-switch transients.

At the user's request, the playground moved from port 18082 to **7466**. The
previous process received verified SIGTERM and exited; its wait status could not
be collected by the replacement launcher. `stop.json` in the old runtime records
that observation. The new process starts without a resident model and loads one
on the next scoring request. The page, scripts, styles, model catalog and status
respond on 7466; the old listener is closed. Evidence: `results/20260917-playground/port-7466.json`.

The frontend now fits the viewport, with Context/Choices/Results tabs on compact
screens and internally scrolling text/results. A fixed action bar and result-copy
footer stay accessible. Very short portrait layouts compact optional content to
retain readable inputs when a keyboard reduces the viewport. Browser fixture
checks pass 13 sizes, including 320×568, 844×390 and 390×360; they check visible
controls, readable input lines, loading, validation, keyboard tabs, resizing,
long result lists, stale results, clipboard and recovery. Fixture probabilities
are not new model evidence. See `results/20260917-playground-layout/`.

The backend process and model snapshots continue unchanged. Static files are
served directly from `web/` with no-store caching, so refresh the browser to use
the layout. `frontend-current.json` in the active runtime records the current
frontend commit and served-file hashes independently of the backend launch
revision. Training source and processes were not modified for this relayout.