chore(release): v1.21.0

[CybotTM]

Version bump 1.20.0 → 1.21.0.

Changes since v1.20.0:

• docs(watcher): driving many PRs at once with parallel pr-status watches
• fix(watcher): one result file per PR in a fresh temp dir
• docs(advanced-git): main worktree is reference only — work in fresh worktrees
• docs(advanced-git): use origin/main as worktree start point in examples
• feat: ship merge-gate.sh the hooks recipe already references
• fix(merge-gate): parse short/=-joined flags; paginate review threads
• docs(pr-workflow): triage review findings individually, not as a batch
• docs(pr-workflow): language-agnostic wording for doc-comment suggestions
• fix(pr-status): tell an enqueued PR apart from a merge-ready one
• docs(pr-status): fix the inverted mergeQueueEntry sentence, spell the ETA null check
• docs(pull-request-workflow): parallel-merged config PR turns green checks red on main
• docs(pr-workflow): follow-up push to an auto-merged branch is silently lost
• docs(pr-workflow): wrap prose, extract .state via --jq, stop on any non-OPEN state
• docs(pr-workflow): signature source-of-truth is the API; systemic failures get central fixes
• docs(pr-workflow): grammar fix in the signature paragraph per review
• docs(git-workflow): warn about destructive checkout and identical hunks
• docs(git-workflow): address review on the checkout and hunk sections
• feat(pr-status): tell a queued check apart from a running one
• fix(pr-status): age the queued signal before calling it a capacity problem
• fix(merge-gate): re-poll UNKNOWN merge state before denying; document silent queue drops
• docs(advanced-git): merge-tip rebase collapse, no tail-piped gates, named staging, worktree .git file
• feat(pr-status): name the unsigned commit instead of saying investigate

Surfaces bumped: .claude-plugin/plugin.json, SKILL.md frontmatter version.

[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Copilot was unable to review this pull request because the user who requested the review has reached their quota limit.