[gustavonline]

Summary

• Establishes the standalone Agentic Power BI System structure and harness-neutral Power BI routes.
• Removes Pi/prompt wiring and preserves doctor, validation, specialist contracts, and operational proof.
• Adds a read-only prepack seed guard that rejects mutable workspace state while allowing curated examples.

Proof

• Doctor, PBIP validation, structural checks, npm test (11 tests), clean seed npm pack --dry-run, and packaging allow/deny/preservation regression pass.
• Optional native Fabric/pbir/Tabular Editor checks are unavailable and are not claimed.

Closes #3
Closes #4