feat: harden PR queue reconciliation against stale/conflicting state (#166)
- Add updated_at (list_prs), + merged_at/merge_commit_sha/closed_at/updated_at (view_pr) for staleness detection in tool output and inventory.
- Surface updated_at in gitea_review_pr inventory report.
- Strengthen gitea-pr-review skill steps, _COMMON_WORKFLOWS, _GUIDE_RULES with explicit live reconciliation checklist, 'do not trust prior handoffs', stop on conflict.
- Add dedicated live queue reconciliation runbook section in docs/llm-workflow-runbooks.md.
- Add passthrough tests and assertions for new fields.
- All gates, redaction, author/reviewer separation untouched.
- Tests pass, py_compile clean, diff clean, secret sweep clean.
Closes #166
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