feat(tooling): share agent skills across Codex and Claude

[spencer-tb]

Description

• Make AGENTS.md the canonical repository guidance and replace CLAUDE.md with a compatibility symlink, following the pattern used by reth.
• Move every existing .claude/commands/ workflow into a repository-scoped Codex skill under .agents/skills/, with the required skill metadata.
• Expose the same canonical skill folders to Claude through symlinks under .claude/skills/.
• Extend /audit-config to check that the canonical skills and Claude symlinks remain in sync.
• Make review tasks strictly read-only: agents return findings in chat or a local draft and never publish GitHub reviews, comments, approvals, reactions, or change requests.

Codex discovers repository skills from .agents/skills/ as documented in the Codex skills guide. Claude loads project skills from .claude/skills/ and supports symlinked skill folders, as documented in the Claude Code skills guide.

Related Issues or PRs

N/A.

Checklist

• Ran fast static checks to avoid CI fails, see Code Standards & Verifying Changes: just static
• PR title has the form <type>(<area>): <title>, where <type> and <area> come from an appropriate C-<type>, respectively A-<area>, label. The title should match the target squash commit message.

Cute Animal Picture

[danceratopz]

Thanks! Quick question below.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.01%. Comparing base (1855bb1) to head (cc6bcc5).
⚠️ Report is 2 commits behind head on forks/amsterdam.

Additional details and impacted files

@@               Coverage Diff                @@
##           forks/amsterdam    #3514   +/-   ##
================================================
  Coverage            94.01%   94.01%           
================================================
  Files                  624      624           
  Lines                36905    36905           
  Branches              3326     3326           
================================================
  Hits                 34695    34695           
  Misses                1533     1533           
  Partials               677      677           

Flag	Coverage Δ
unittests	94.01% <ø> (ø)

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[danceratopz]

Thanks! 💕

• Verified skills with the skill validator... then:
• Pushed commit cc6bcc5 with two small documentation fixes:
  1. Updated enhance-ported-test to link to ../write-test/SKILL.md#transactions. The
     previous write-test.md reference became invalid when the flat .claude/commands/
     files were moved into separate .agents/skills//SKILL.md directories.
  2. Updated the fork layout guidance from state.py to state_tracker.py; every
     current fork now uses the latter.