[codex] Move Agent Monitor runtime in-process

[aeyeCEO]

References

• PRD-407
• PLN-775

Summary

• Moves the Agent Monitor runtime into the Electron main process instead of spawning the sidecar runtime as a separate process.
• Preserves the fixed loopback runtime contract, health checks, hook opt-in behavior, and iframe/preload wiring.
• Updates focused runtime/wiring coverage and documents the PRD-407 in-process-only scope.

Tests

• tsc --noEmit
• focused tsx tests
• build:agent-monitor
• full build
• full desktop test
• runtime health smoke
• port-conflict smoke

[github-actions]

Compatibility Smoke Test Results ⚠️

Status: skipped
Electron SHA: de3b6cce5ae19a9f6c86a8fa110ef2730eecee02
Symphony Alpha SHA (last-known-good): 24741ed9be45cc761195d7a7b6613bd30cdfce84
Note: Skipped because the stage GitHub App credentials are not configured for this workflow run.

View Actions run

[mikeangstadt]

Other open PRs disaggregate this PoC into it's landable parts; closing out.