Dated experiment record. Statements describe this run, not current submission readiness. Historical H. pylori category names do not establish infection; copy screens are bounded tests. Claims that a source does not exist mean none was identified in that recorded search, not proof of absence. Licensing interpretations in the notes remain unconfirmed. Local access details have been omitted. Current limitations and remaining work.

Q3 corrected exact-canvas gate report

Post-hoc data notice (2026-08-27): the upstream LoRA was trained with held-out-slide leakage. This run was already rejected; its mechanics remain historical evidence only. See reports/SLIDE_SPLIT_AUDIT_REPORT.md.

Outcome

FAIL; interrupted and mechanically ineligible. Spot A100 run 20260826T165518Z-canvas-gate used the preregistered corrected Q3 configuration on deployed commit 14e22d7b72593afda2b5e40be4561bfe2a760987. It completed normal, H. pylori-gastritis, and intestinal-metaplasia fields, then GCP preempted the worker while it was generating the eighth mixed-category detail tile. The run never wrote QWEN_CANVAS_GATE_COMPLETE, ALL_SHA256SUMS, canvas_gate_verification.json, or privacy_screen.json.

The shell EXIT trap recorded exit code 0 during termination. That value is not a success result: the missing terminal marker and GCP operation systemevent-1787766526972-659f6d4c81380-877dc487-b87d418a establish an interrupted run. The worker is corrected so TERM, HUP, and INT now produce nonzero codes, RUN_FAILED, and an explicit signal record.

No output from this attempt is submission-eligible.

Frozen inputs

Generator: Qwen/Qwen-Image-2512 with caption-neutral epoch-3 LoRA SHA-256 ab11358b0b54a7a2c461f93fdc2a2fcccc15da4944dfbe5d6c6340b3d4df6d24.
Gate configuration SHA-256: 890744c320718f8b6c3a12caf23035255f43210dd4902f3e8a9a182dd2570d13.
Prompt override SHA-256: 4cb227a987db2790f563f5cf9ac5c549c3997238918757b741d02c89640e0a98.
Correction relative to Q3 v1: denoising strength 0.95 for every detail tile and antialiased q3-surface-lumen-antialiased-v1 microdetail for the two positive categories. All other checkpoint, prompt, seed, sampling, geometry, and assembly variables remained frozen.

Recovered evidence

Worker interval: 2026-08-26T16:55:18Z to termination handling at 2026-08-26T17:48:34Z, 3,196 seconds.
GCP records compute.instances.preempted at 2026-08-26T17:48:46.972Z; the instance reached TERMINATED at 2026-08-26T17:49:02.245Z.
Three categories contain CANVAS_COMPLETE, generation manifests, all eight detail tiles, exact 4096x2048 RGB canvases, and matching final hashes. Mixed contains only seven of eight detail tiles and no candidate or completion marker.
The locally generated recovery manifest contains 64 recovered source files and has SHA-256 503eef671e5106322bb148218409783f7b279eb78a9f00d94043f9d87d2cc941. It is explicitly labelled local recovery evidence, not a remote completion manifest.

Completed category	Candidate SHA-256	Seam ratio	No-organism mean absolute gradient	Frozen floor
normal	`47627c87ddd82a50db2f4379485ed17a9bb6f6b1d074061e7347710e2dad7c5c`	1.105794	2.982779	3.0
H. pylori-gastritis	`77d4e0326b23a6e29caaf711836e08300b8e8242ff49669aacdc456ebecf66fa`	1.124654	3.018435	3.0
intestinal metaplasia	`d2677a3e8df206c06a8e5327df21b954bc230816d171869c3a0fc9c96eb99b97`	1.094998	3.065252	3.0

Even ignoring the interruption, the normal field misses the preregistered sharpness floor by 0.017221, or 0.57%. The whole four-field gate therefore cannot pass. Privacy was not run because the candidate set is incomplete.

Full-resolution engineering review

The 0.95 detail setting is materially sharper than Q3 v1 and produces coherent continuous glandular tissue without visible tile seams.
The normal field still contains extensive clear/vacuolated cells and is not a reliable normal control.
The H. pylori-gastritis and intestinal-metaplasia fields remain too visually similar to the normal field. This confirms that the shared four-category LoRA does not provide reliable category separation at final scale.
Antialiased positive-field organisms are less hairline-like than Q3 v1 but remain an engineering rendering pending clinical review.

Runtime, cost, and cleanup

A100 uptime was 3,420.715 seconds. At the conservative on-demand list rate of US$3.673385/hour, compute is at most US$3.49 before credits and tax; the interrupted instance used Spot capacity.
The bounded recovery CPU ran 748.769 seconds, approximately US$0.03 at US$0.134/hour.
The A100 and recovery CPU are terminated. The exact temporary recovery instance, disk, and snapshot were deleted after local retrieval; the original stopped Qwen disk remains.

Scientific conclusion

The corrected tile denoising materially improves texture, but the experiment fails both the immutable whole-run contract and category fidelity. The next experiment must not tune the observed sharpness threshold or another nearby denoising value. Reopen the model path as preregistered: compare an eligible category-specialist Qwen LoRA strategy against the shared checkpoint, while excluding pathology-native challengers whose non-commercial/no-derivatives terms are incompatible with direct company submission and downstream challenge rights.

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