root 357dd10670 SKILL.md sync: reject isolated edits to the .agents/ copy ...

Diego asked the right question: what if someone edits the Codex
side directly? Until now the sync was unidirectional (root →
.agents/) but the hook only fired when root SKILL.md was staged —
isolated .agents/ edits sneaked past the hook locally and only got
caught by CI's --check. A future ``make sync-skill`` would then
silently destroy them.

Hardened both layers to reject the asymmetric case at the moment
of the commit/PR:

- Pre-commit hook now classifies the staged set and REJECTS
  commits that stage .agents/skills/.../SKILL.md in isolation,
  with a step-by-step message: move the edit into root SKILL.md
  and re-stage. The hook still auto-syncs when root SKILL.md is
  staged.

- CI gate adds a second step (PR-only) that diffs the PR's base
  against head; if .agents/ moved but root SKILL.md didn't, fails
  with an actionable error before the build proceeds.

- README documents the direction explicitly: edits land in root
  SKILL.md; .agents/ is auto-generated; Codex-specific instructions
  belong in AGENTS.md, not in the SKILL.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

2026-04-25 23:00:51 -03:00

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