M10: Advanced Skills

[bug-ops]

Embedding-based skill matching, hot-reload, and expanded bundled skills.

Effort: L (8 SP)
Target: v0.5.0
Dependencies: M9 (complete)

Deliverables

• Skill matcher: embed skill descriptions at load time, match top-K per query
• Selective injection: only relevant skills in prompt (not all)
• max_active_skills config to control token budget
• Hot-reload via notify crate watching skill directories
• Skill priority: project > user > bundled (same name -> highest wins)
• Additional bundled skills: git, docker, api-request
• Skill usage statistics in SQLite (skill_name, count, last_used)

Acceptance Criteria

• With 10+ skills loaded, only top 3-5 relevant ones injected per query
• Adding a new SKILL.md file picked up without restart
• Project skills override user skills with same name
• /skills command shows usage statistics
• Token savings: system prompt shrinks compared to inject-all approach

Phases

• Phase 1: Embedding-based skill matcher — M10/Phase 1: Embedding-based skill matcher #75
• Phase 2: Hot-reload + skill priority — M10/Phase 2: Skill hot-reload and priority #76
• Phase 3: Bundled skills + usage statistics — M10/Phase 3: Bundled skills and usage statistics #77