Unify issue lifecycle labeling and sweep into a single system (#25352)

* Unify issue lifecycle labeling and sweep into a single system

Consolidate issue triage, stale detection, and lifecycle enforcement into
two components: a Claude-powered triage workflow and a unified sweep script.

Triage workflow changes:
- Add issue_comment trigger so Claude can re-evaluate lifecycle labels when
  someone responds to a needs-repro/needs-info issue
- Add concurrency group per issue with cancel-in-progress to avoid pile-up
- Filter out bot comments to prevent sweep/dedupe triggering re-triage
- Hardcode allowed label whitelist to prevent label sprawl (was discovering
  labels via gh label list, leading to junk variants like 'needs repro' vs
  'needs-repro')
- Replace MCP GitHub server with gh CLI — simpler, no Docker dependency,
  chaining is caught by the action so permissions are equivalent
- Add lifecycle labels (needs-repro, needs-info) for bugs missing info
- Add invalid label for off-topic issues (Claude API, billing, etc.)
- Add anti-patterns to prevent false positives (don't require specific
  format, model behavior issues don't need traditional repro, etc.)

Sweep script changes:
- Absorb stale issue detection (was separate stale-issue-manager workflow)
- Mark issues as stale after 14 days of inactivity
- Skip assigned issues (team is working on it internally)
- Skip enhancements with 10+ thumbs up (community wants it)
- Add invalid label with 3-day timeout
- Add autoclose label support to drain 200+ legacy issues
- Drop needs-votes (stale handles inactive enhancements)
- Unify close messages into a single template with per-label reasons
- Run 2x daily instead of once

Delete stale-issue-manager.yml — its logic is now in sweep.ts.

## Test plan

Dry-run sweep locally:
GITHUB_TOKEN=$(gh auth token) GITHUB_REPOSITORY_OWNER=anthropics   GITHUB_REPOSITORY_NAME=claude-code bun run scripts/sweep.ts --dry-run

Triage workflow will be tested by opening a test issue after merge.

* Update .github/workflows/claude-issue-triage.yml

Co-authored-by: Ashwin Bhat <ashwin@anthropic.com>

---------

Co-authored-by: Ashwin Bhat <ashwin@anthropic.com>

.github/workflows/sweep.yml

@@ -1,8 +1,8 @@
-name: "Daily Issue Sweep"
+name: "Issue Sweep"
 
 on:
   schedule:
-    - cron: "0 10 * * *" # 2am Pacific
+    - cron: "0 10,22 * * *"
   workflow_dispatch:
 
 permissions: