docs: add small bugfix sweep skill

.agents/skills/openclaw-small-bugfix-sweep/SKILL.md

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+---
+name: openclaw-small-bugfix-sweep
+description: Fix only small, high-certainty OpenClaw bugs from a pasted issue/PR list after deep code review.
+---
+
+# OpenClaw Small Bugfix Sweep
+
+Batch workflow for pasted OpenClaw issue/PR refs.
+Execute, do not summarize.
+Triage does not commit, push, create PRs, comment, close, label, land, or merge.
+
+## Companion Skills
+
+Use `$gitcrawl` first, `$openclaw-pr-maintainer` for live GitHub hygiene, `$github-deep-review` posture for source tracing, and `$openclaw-testing` for proof.
+
+## Loop
+
+For each ref:
+
+1. Read live target with `gh`.
+2. Check `gitcrawl` for related, duplicate, closed, or already-fixed threads.
+3. Read body, comments, linked refs, changed files, current code, adjacent tests, and dependency contracts when relevant.
+4. Trace the real runtime path.
+5. For issues: fix locally only if this is a bug, current code proves root cause, the implicated path is clear, and a narrow patch is cleaner than refactor.
+6. For PRs: decide `ready-to-merge`, `needs-fixup`, or `skip`; do not alter PR branches unless explicitly asked.
+7. Add focused regression proof when practical for local issue fixes or PR readiness checks.
+8. Run the smallest meaningful gate.
+9. Continue until every pasted ref is fixed or classified.
+
+No subagents unless explicitly requested.
+
+## Skip If
+
+- not a bug
+- config/docs/workflow/release/support/dependency/product work
+- repro or root cause is uncertain
+- larger refactor or owner-boundary change is cleaner
+- already fixed on current `main`
+- dependency behavior is guessed
+- no focused proof is feasible
+
+Skip with terse reason. Do not pad with low-confidence fixes.
+
+## Fix Rules
+
+- owner module first; generic seam only when required
+- existing patterns/helpers/types
+- no drive-by refactors
+- tests near failing surface
+- docs only for changed public behavior
+- no commit/push/create PR/comment/close/label/land/merge unless explicitly asked
+
+## PR Rules
+
+- `ready-to-merge`: code is good, current head checked, required proof is green or clearly pending only external CI; list for maintainer merge or `@clawsweeper automerge`
+- `needs-fixup`: small bug is clear, but PR branch needs changes; list exact files/tests and wait for explicit fix/push/automerge instruction
+- `skip`: broad, stale, speculative, config/product/security/release, owner-boundary, or refactor-sized
+- if source PR is untrusted/uneditable, do not create a replacement PR during sweep
+
+## Output Shape
+
+Ledger: `fixed-local`, `ready-to-merge`, `needs-fixup`, `skipped`, `needs-human`.
+Final: issue files left on disk, PRs ready for merge/automerge, tests/gates, skip reasons.