v0.18.2

Added

• Added an opt-in Integrator execution stage and execution.with_integrator
  graph loop for high-assurance Codex runs. The new
  default_codex_integrated and learning_codex_integrated modes run
  builder -> integrator -> checker, with Integrator writing
  integration_report.md before normal Checker QA.
• millrace status and millrace status show now support --format json,
  including blocked-idle diagnostics and the latest runtime error report path.

Fixed

• Invalid Recon handoff artifacts now block the active probe with
  recon_handoff_invalid instead of letting malformed probe output fall into
  ordinary planning recovery.
• Graph-loop asset validation now rejects Recon handoff outcomes wired directly
  to stage nodes; typed Recon promotion must remain runtime-owned.
• Stage-request construction now refuses stale stage/work-item pairings before
  runner invocation, preventing Manager from receiving probe work.