feat(skills): add built-in skill-creator

[xxchan]

Summary

• ship built-in skill-creator in the package skills directory
• load builtin skills alongside user skills with user overrides
• update docs, NOTICE, packaging, and tests

Testing

• uv run pytest tests/test_skill.py

[Copilot]

Pull request overview

This PR adds built-in skill support to Kimi CLI by shipping a "skill-creator" skill inside the application bundle and implementing a system to load both built-in and user skills with user override capability.

Key Changes

• Implemented multi-root skill discovery with user override support (later directories override earlier ones)
• Added built-in "skill-creator" skill with comprehensive guidance for creating effective skills
• Updated PyInstaller configuration to bundle the skills directory with the application

Reviewed changes

Copilot reviewed 8 out of 8 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
src/kimi_cli/skill.py	Added get_builtin_skills_dir() and discover_skills_from_roots() functions to support discovering skills from multiple directories with override behavior
src/kimi_cli/soul/agent.py	Updated agent initialization to discover skills from both builtin and user directories, with user skills overriding builtin ones
src/kimi_cli/skills/skill-creator/SKILL.md	Added comprehensive 373-line built-in skill providing guidance for creating and managing skills
src/kimi_cli/utils/pyinstaller.py	Added skills/** pattern to include builtin skills in the PyInstaller bundle
tests/test_skill.py	Added test for discover_skills_from_roots() function verifying the override behavior
docs/en/customization/skills.md	Updated English documentation to explain built-in skills and override behavior
docs/zh/customization/skills.md	Updated Chinese documentation to explain built-in skills and override behavior
NOTICE	Added attribution for OpenAI Codex content used in the skill-creator skill

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[stdrc]

Nice work on adding built-in skills support!

What I like:

1. Proper attribution in NOTICE file for Codex-derived content
2. User skills can override built-in skills - good design
3. discover_skills_from_roots() cleanly handles multiple skill directories
4. Documentation updated in both EN and ZH

The skill-creator content itself:

• Comprehensive guide for creating skills
• Good principles: conciseness, degrees of freedom, practical examples
• Covers both user-invocable and proactive skills

Questions/Suggestions:

1. The skill content is quite long (300+ lines). Is there a way to load it lazily only when needed?
2. Will there be more built-in skills in the future? If so, might be worth documenting the criteria for what becomes built-in vs. user-provided

Overall a solid addition that will help users create better skills!

Reviewed by Alice (AI agent)

[xxchan]

Thanks for the thoughtful review!

On lazy loading: discovery only parses the YAML frontmatter (via read_frontmatter), and the full SKILL.md is read only when a skill is invoked (e.g. /skill:...). So the long content should not add much startup overhead; happy to optimize further if we see a perf issue.

On future built-ins: no concrete plan right now beyond keeping the built-in set minimal and broadly useful. If we add more, I can document clearer criteria (e.g. cross-project utility + low maintenance + good user override story).