feat: /document-release skill — post-ship doc updates (v0.4.3) (#109) * docs: update project documentation for v0.4.2 - README: skill count 9→10, added /document-release to skills table, install/uninstall sections, and dedicated section with example - CHANGELOG: added /document-release bullet to v0.4.2 entry Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * feat: add /document-release skill with smart VERSION handling New skill runs after /ship but before PR merge. Reads every doc file, cross-references the diff, auto-updates factual changes, asks about risky edits. CHANGELOG clobber protection: never uses Write tool on CHANGELOG.md, only Edit with exact old_string matches. Smart VERSION logic: instead of silently skipping already-bumped versions, compares CHANGELOG entry scope against full diff and asks if significant uncovered changes exist. Also fixes gstack-upgrade/SKILL.md missing from skill-check.ts SKILL_FILES array (existing inconsistency with gen-skill-docs.ts). Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * feat: /review Step 5.6 — documentation staleness check Review skill now cross-references code changes against doc files. If a doc describes a feature that changed but the doc wasn't updated, flags it as INFORMATIONAL with a pointer to /document-release. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * test: /document-release E2E with CHANGELOG clobber guard E2E test creates a repo with existing CHANGELOG entries, runs /document-release, and asserts original entries survive. Critical guardrail against the incident where an agent replaced CHANGELOG entries during conflict resolution. Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * chore: bump to v0.4.3 — /document-release skill Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com> * chore: regenerate SKILL.md files after merge * chore: regenerate SKILL.md files after merge --------- Co-authored-by: Claude Opus 4.6 (1M context) <noreply@anthropic.com>