Let agents fix, refine, and propose skills

[haok1402]

Reworks the Agent Skills section of AGENTS.md so agents don't just use skills, they help keep them sharp. In an agent-native repo, the skill-set should improve as a byproduct of use, not only through deliberate maintenance passes.

• Removed the hardcoded skill list. Claude Code loads .agents/skills/ automatically, so listing them inline was redundant and went stale.
• Added a maintenance norm. Agents fix broken skills, refine rough ones, and propose new skills for uncovered work. All changes go up for review, not edited silently.

[gemini-code-assist]

Code Review

This pull request updates the AGENTS.md file to clarify how AI agents should maintain and update agent-native workflows (skills). The feedback suggests making the instructions more precise for AI agents by clarifying ambiguous phrases, such as specifying that changes should be proposed in a pull request and clarifying the phrasing around uncovered skills.

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