implement-queuelisted

# Implement Queue Work through the `ready` issue backlog: parallel implementation, serial merging. **Priority principle: Security > CI fixes > Features > Audit findings.** **Quality principle: every issue goes through the full implement-issue pipeline (TDD, gates, review) inside its worker. No shortcuts.** ``` Phase 0: Pre-flight (main green? open PRs?) Phase 1: Claim batch (≤3 independent ready issues) Phase 2: Implement in parallel worktree subagents → PRs Phase 3: Serial merge train (oldest green PR first) Phase 4: Loop or stop ``` ## Phase 0: Pre-flight **Main must be green** before any new work (green-main policy): ```bash gh run list --branch main --limit 5 --json status,conclusion,name,databaseId \ | jq '[.[] | select(.conclusion == "failure")]' ``` If main is red: fixing it IS the iteration. Create/pick up a `ci-fix` issue, fix, and skip to Phase 3. **Open PRs come before new issues.** Unfinished PRs are higher-value than fresh work: ```bash gh pr list --state open --json number,title,headRefName,statusCheckRollup,mergeStateStatus ``` - CI green → feed into the Phase 3 merge train now. - CI pending → note PR number; merge train will pick it up. - CI failed → fix the failure (or label the linked issue `agent-failed` if unfixable this iteration). Only proceed to Phase 1 once no open PR is in a failed state. ## Phase 1: Claim Batch ```bash gh issue list --label "ready" --state open --json number,title,body,labels --limit 20 ``` **Sort:** 1) security (`fix