Closed-loop execute (V-model right arm)

Mechanical verification pipeline. Every verify step emits evidence rows tied to acceptance criterion IDs (AC-n).

When to use

The harness is opt-in. Run it when:

• Invoked as /closed-loop <task> or /closed-loop <spec-path>.
• The user asks for the closed loop, proper verification, or an evidence trail.
• verification_harness: on in 00-inbox/MY-PROFILE.md and this is a build task.
• Another skill that declares a normal+ lane reaches its verify step.

Do not run it on a request that did not ask for it. Notes, briefs, research, drafts, and ordinary edits are not harness runs, and a checkpoint ledger on those is pure overhead.

Phase 0 — Lane + run folder