process: derived artifacts are accepted on dev once per beta (#697)

The screenshot fingerprint and golden baselines stop being a tax on every
task branch:

- Task branches no longer commit docs/images/** or golden baselines. On a
  branch the screenshot freshness stays a preflight warning; the review
  prompt, REVIEWER.md and AUTHOR.md drop check-docs as a per-task gate.
- beta-derived.yml refreshes them on dev in one bot commit before the beta
  candidate: canonical docs capture + docs:accept --reviewed, golden from
  the golden-images artifact of a completed Validate on dev +
  golden:accept --reviewed. A changed frame or scene is accepted only when
  named in the inputs; undeclared differences refuse. Baseline commits carry
  Release: and Baseline-Reviewed:; the subject is not a candidate subject.
- classify-changes: the Release: trailer on an issue/* branch no longer
  switches on the heavy set. ci:full / ci:golden do: process-track emits
  full=true, the review gate dispatches Validate with full=true and does not
  accept a light proof.

Canon: PROCESS.md §3 п.13, §5.1, §8, §11.4; CONTRIBUTING.md.

Issue: #697
User-Visible: no
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018qZfe7YS4rqEMKoVeS3GKd

scripts/classify-changes.mjs

@@ -88,13 +88,23 @@ export function classifyAll() {
  *  - `workflow_dispatch` с `full=true` — ночной прогон (nightly.yml) и ручной;
  *  - pull_request — там Validate единственный сигнал.
  */
-export function heavyGatesRequested({ eventName, headMessage, fullInput } = {}) {
+export function heavyGatesRequested({ eventName, headMessage, fullInput, refName } = {}) {
   if (eventName === 'pull_request') return true;
   if (eventName === 'workflow_dispatch') return String(fullInput) === 'true';
   if (eventName === 'schedule') return true;
+  // #697: на ветке задачи трейлер `Release:` тяжёлый набор больше не включает.
+  // Его там носит только приёмка эталонов, а golden на ветке задачи — по метке
+  // `ci:golden`: конвейер ревью диспатчит Validate с `full=true` сам. Кандидат
+  // беты и релиза собирается на `dev` — там трейлер работает как прежде.
+  if (isTaskBranch(refName)) return false;
   return hasReleaseTrailer(headMessage);
 }
 
+/** Ветка задачи — `issue/<NN>-…` (PROCESS §3). */
+export function isTaskBranch(refName) {
+  return /^issue\//.test(String(refName || '').replace(/^refs\/heads\//, ''));
+}
+
 /**
  * Нужны ли мутанты по диффу (#510, сужено в #601). За 08–09.09 они съели 86 %
  * job-минут Validate, потому что бежали на каждом промежуточном пуше и
@@ -159,6 +169,7 @@ if (invokedDirectly) {
       eventName: process.env.EVENT_NAME,
       headMessage: process.env.HEAD_MESSAGE,
       fullInput: process.env.FULL_INPUT,
+      refName: process.env.REF_NAME,
     })}\n`);
   } else if (process.argv.includes('--heavy')) {
     // Отдельный вызов: у `heavy` другие входы (событие, сообщение head-коммита),
@@ -167,6 +178,7 @@ if (invokedDirectly) {
       eventName: process.env.EVENT_NAME,
       headMessage: process.env.HEAD_MESSAGE,
       fullInput: process.env.FULL_INPUT,
+      refName: process.env.REF_NAME,
     });
     process.stdout.write(`heavy=${heavy ? 'true' : 'false'}\n`);
     const mutants = mutantsRequested({