chore(skills): 接入 caveman 系列 agent skills

同步 skills-lock，便于压缩沟通、提交与评审等快捷模式。

Co-authored-by: Cursor <cursoragent@cursor.com>

.agents/skills/caveman-commit/README.md

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+# caveman-commit
+
+Terse Conventional Commits. Why over what.
+
+## What it does
+
+Generates commit messages in Conventional Commits format. Subject ≤50 chars, hard cap 72. Imperative mood. Body only when the *why* is non-obvious or there are breaking changes. No AI attribution, no "this commit does X", no emoji unless the project uses them. Body always required for breaking changes, security fixes, data migrations, and reverts — future debuggers need the context.
+
+Outputs only the message. Does not stage, commit, or amend.
+
+## How to invoke
+
+```
+/caveman-commit
+```
+
+Also triggers on phrases like "write a commit", "commit message", "generate commit".
+
+## Example output
+
+Diff: new endpoint for user profile.
+
+```
+feat(api): add GET /users/:id/profile
+
+Mobile client needs profile data without the full user payload
+to reduce LTE bandwidth on cold-launch screens.
+
+Closes #128
+```
+
+Diff: breaking API rename.
+
+```
+feat(api)!: rename /v1/orders to /v1/checkout
+
+BREAKING CHANGE: clients on /v1/orders must migrate to /v1/checkout
+before 2026-06-01. Old route returns 410 after that date.
+```
+
+## See also
+
+- [`SKILL.md`](./SKILL.md) — full LLM-facing instructions
+- [Caveman README](../../README.md) — repo overview