Two bugs found by Codex adversarial review:
1. Sidecar path mismatch: generated Codex skills referenced
.agents/skills/gstack-review/checklist.md but setup creates
sidecars at .agents/skills/gstack/review/. Fixed path rewriter
to emit .agents/skills/gstack/review/ (matching setup layout).
2. Setup installed Claude-format source dirs for Codex global
install instead of the generated Codex-format skills. Split
link_skill_dirs into link_claude_skill_dirs (source dirs for
Claude) and link_codex_skill_dirs (generated .agents/skills/
gstack-* dirs for Codex).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>