Delegate AgentPlane commands to sp-run

[mdheller]

Summary

Adds prophet agentplane ... as a pure facade delegation to the AgentPlane-owned sp-run command.

This preserves the implementation boundary:

• SocioProphet/agentplane owns governed-runner implementation and sp-run.
• SocioProphet/prophet-cli exposes the stable operator-facing facade.

Adds

• sp-run delegate registration in src/prophet_cli/cli.py
• prophet agentplane ... parser branch
• tests for:
  • prophet agentplane doctor
  • prophet agentplane preflight <contract>
  • prophet agentplane admit <contract> --preflight <preflight> --authority-state <state>
  • missing sp-run delegate returns 127
• README delegation table and examples

Commands

prophet agentplane doctor
prophet agentplane preflight ./governed-run-contract.json
prophet agentplane admit ./governed-run-contract.json --preflight ./preflight-receipt.json --authority-state ./agent-authority-current-state.json --projected-cost-usd 0.25
prophet agentplane dossier ./.socioprophet/runs/governed-run-alpha-001
prophet agentplane validate-dossier ./run-dossier.json

Boundary

prophet-cli does not own AgentPlane evidence contracts, governed-runner implementation, Agent Registry grants, or authority state.

It delegates to sp-run ... exactly like existing SourceOS delegation delegates to sourceosctl ... and AgentTerm delegation delegates to agent-term ....

Validation

pytest -q