feat(skills): add repo-sweep skill for multi-repo agent dispatch
Orchestrates dispatching agents across multiple repos with:
- Repo selection (all, by org, by language, explicit list)
- Configurable persona + template + task per sweep
- Concurrency-aware dispatch with queue monitoring
- Finding triage: actionable → Forge issue, informational → OpenBrain, noise → ignore
- Summary report with per-repo findings
5 default profiles: quality, security, conventions, tests, docs.
Uses testing/reality-checker persona for quality sweeps.
Co-Authored-By: Charon <charon@lethean.io>
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