EndeavourYuan 6b6be20f32 feat(command): add /skill slash command to list enabled skills
- Register /skill in BUILTIN_COMMAND_SPECS with wrench icon
- Add cmd_skill handler that lists skill names and descriptions
- Disabled skills are excluded from the output
- Add 6 tests covering empty list, names/descriptions, disabled
  filtering, fallback description, markdown output, and router
  registration
2026-06-05 18:48:51 +08:00
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2026-06-05 01:17:34 +08:00