Revamp Central Agentic Ops dashboard

[mnkiefer]

• Revamps the Central Agentic Ops dashboard:
  • Rebuilds the Pages dashboard around operations, repositories, workflows, reports, and insights.
  • Adds repository-level Reports and Insights views, workflow health, run history, and AI Credit usage.
  • Makes report ingestion durable when source runs are unavailable.
  • Adds bounded repository allowlisting and safer control-plane routing.
  • Moves report generation from a skill/package to conventional scripts plus pages.yml.
  • Updates documentation and contracts for the new architecture.