codex-execute-phase

Point the skill at a plan produced by codex-plan-phase, defaulting to the latest plans/phase-plan-*.md file. It runs preflight git checks, executes lanes in topological order, runs verification commands, and emits a structured closeout with the next phase and command.

Each lane's Owned files entries define the write contract; the executor edits only those paths and treats consumed interfaces as read-only. If implementation requires touching another lane's files, execution stops and routes back to planning for an ownership amendment.

Parallel worker fanout is allowed only when the user explicitly requests it and the DAG-ready lanes are disjoint with machine-verified ownership. Each worker brief assigns exact owned files, read-only files, and requires a final report of changes, tests, and blockers.

The executor diagnoses the failure once and repairs it within the lane if the cause is local. If the same verification still fails, it reports a blocked status with blocker_class=repeated_verification_failure instead of forcing completion.

The blocker triggers when dirty paths are unowned, ignored outputs are typed unknown by phase-loop-closeout-audit, or unrelated user work overlaps required lane files. Phase-owned outputs with passing verification instead report awaiting_phase_closeout for the runner to commit.