fix(sync): only PRs merged into the default branch transmit - #308

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@v4, actions/setup-node@v4. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

evaluateTranslation: response missing numeric criteria [formatting] — retrying

evaluateTranslation: findings payload missing or malformed — recommendation will fail closed to editor

Deterministic diff check failed — headingMapCorrect: lectures/cobweb.md: no heading map in frontmatter (expected 1)

evaluateTranslation: findings payload missing or malformed — recommendation will fail closed to editor

Source content not found for lectures/lecture.md in source PR #716

Target content not found for lectures/lecture.md @ targeth — the translation PR removes this file, and it was not matched to a deletion in the source PR

Could not fetch source PR #716: Error: API rate limit exceeded

Source content not found for lectures/intro.md in source PR #716

Target content not found for lectures/intro.md @ targeth — the translation PR removes this file, and it was not matched to a deletion in the source PR

Deterministic diff check failed — headingMapCorrect: lectures/aiyagari.md: no heading map in frontmatter (expected 1)

Shadow auto-merge gate: would auto-merge PR #42 (recorded in the verdict block; no action taken)

Shadow auto-merge gate: would NOT auto-merge PR #42 — 1 minor finding(s) in gating categories (accuracy/terminology/syntax/diff-check/other) (recorded in the verdict block; no action taken)

Shadow auto-merge gate: would auto-merge PR #42 (recorded in the verdict block; no action taken)

Shadow auto-merge gate: would NOT auto-merge PR #42 — diff check failed: headingMapCorrect (recorded in the verdict block; no action taken)

Shadow auto-merge gate: would NOT auto-merge PR #42 — 1 minor finding(s) in gating categories (accuracy/terminology/syntax/diff-check/other) (recorded in the verdict block; no action taken)

Shadow auto-merge gate: would auto-merge PR #42 (recorded in the verdict block; no action taken)