trunk/63ad7b4a33ce67e987e216a750f638cbdcf5f2b8: Add deprecate-feature agent skill and AGENTS.md pointer (#201299)

发生了什么

Linked issue or supporting maintainer Part of #201298 BC-breaking? No Summary (human written only) Read the code friendos Agent details (if applicable) Adds a /deprecate-feature agent skill ( .agents/skills/deprecate-feature/SKILL.md ) and a short Deprecations section in AGENTS.md pointing to it. The skill covers: warning for at least two releases with concrete start/removal versions in the message, freezing compone…

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