v1.32.1.0 fix: cleanup stale flat Codex skill directories on setup install

[yihui315]

Summary

The setup script now detects and removes stale flat Claude-format skill directories (from pre-prefixed older Codex installs) that can shadow the generated gstack-* Codex skills and still point at ~/.claude/skills/gstack runtime paths.

Changes

• setup: Added cleanup_stale_codex_skill_dirs() function that removes stale flat gstack-* skill directories from ~/.codex/skills/ before linking new Codex-format skills
• test/gen-skill-docs.test.ts: Added test coverage for the cleanup logic

Test results

381 pass
0 fail
5336 expect() calls
Ran 381 tests across 1 file. [2.67s]

Documentation

• CHANGELOG.md updated (v1.32.1.0)
• VERSION bumped to 1.32.1.0

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