fix(agents): install Codex skills to .agents/skills

[knoxgraeme]

Summary

AGENT_CONFIGS for Codex pointed skill installs at .codex/skills, but Codex only scans .agents/skills (repo scope, walked up to the repo root) and $HOME/.agents/skills (user scope) — .codex is config-only (config.toml). Skills installed with skillfish add --agent Codex landed in a directory Codex never reads: the install reported success, but the skill was invisible to Codex.

Changed the Codex entry's dir from .codex/skills to .agents/skills. homePaths/cwdPaths are untouched — they're still used purely for detecting that Codex is present (.codex/config.json, .codex/settings.json, .codex), which is unaffected by this change. No globalDir override is needed: getAgentSkillDir joins dir onto the home directory for global installs, so this alone resolves to ~/.agents/skills for global scope and <project>/.agents/skills for project scope, matching both locations from the issue.

Not included: a migration/warning path for skills previously installed under the old .codex/skills location. That's optional follow-up scope beyond the root-cause fix and is worth tracking separately.

Related Issue

Fixes #81

Type of Change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• New agent support (adds support for a new AI agent)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Documentation update

Checklist

• My code follows the project's style guidelines
• I have added tests that prove my fix works
• All new and existing tests pass (npm test)
• The build succeeds (npm run build)
• I have updated documentation if needed

Testing

• npm run typecheck, npm run lint, npm run build, and npm test all pass (250/250 tests).
• Added a regression test in src/__tests__/agents.test.ts asserting the Codex config's dir is .agents/skills.

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