[Phase2] Queue Hardening Patchset - Reframe

[Prekzursil]

Objective

Harden Wave-1 queue and label workflows for monorepo-safe idempotency and predictable failure handling.

Scope

• .github/workflows/agent-task-queue.yml
• .github/workflows/agent-label-sync.yml
• .github/ISSUE_TEMPLATE/agent_task.yml
• .github/agents/triage.agent.md

Required changes

• Add idempotency guard for duplicate label events.
• Narrow removeLabel catch behavior to expected not-found conditions.
• Add rollback cleanup for partial label mutations.
• Convert label sync to update-first + create-on-404.
• Add push trigger for label-sync on workflow file updates.
• Normalize risk values to risk:low|risk:medium|risk:high.
• Remove edit tool from triage profile.

Acceptance criteria

• Duplicate issue label events do not post duplicate queue contracts.
• Failed queue attempts leave issue labels recoverable and explicit.
• Label-sync can run repeatedly with no drift.
• Risk taxonomy is aligned between forms and labels.

Verification

• make verify
• One controlled queue test issue after patchset merge.

[github-actions]

@copilot Please implement this task using repository guardrails.

Execution Contract

1. Decompose work by monorepo slice and keep ownership explicit.
2. Keep changes minimal and avoid unrelated refactors.
3. Required verification command: make verify.
4. Include PR sections: Summary, Risk, Evidence, Rollback, Scope Guard.
5. Do not merge; maintainers perform final review.

Source Issue

• [Phase2] Queue Hardening Patchset - Reframe #59: [Phase2] Queue Hardening Patchset - Reframe

[Prekzursil]

Phase-2 hardening completed and merged with human review.