Plan 06 — Verifier sub-type + `vitest`

[carlomigueldy]

Plan file: docs/superpowers/plans/2026-05-23-plan-06-verifier-subtype-and-vitest.md
Tag at close: v0.0.6-plan-06
Depends on: Plan 05

Goal

Introduce the verifier adapter sub-type — adapters that execute a verification command, report exit code + structured output, and feed the orchestrator's state-machine gate. Ship @dycode/adapter-vitest and make task.verification actually gate active → passing transitions.

Deliverable

• VerifierAdapter interface in @dycode/adapter-sdk (bumps to 0.2.0).
• adapters/vitest package with JSON-reporter parsing.
• orchestrator/verify.ts runs verifier, records verify_run evidence.
• State machine refuses active → passing unless last verify_run exit code = 0.
• F31–F36.

Out of scope (deferred to later plans)

• Other verifiers (jest, tsc, eslint, playwright) → Plan 11
• Verifier output replay UI → Plan 13
• Cross-workspace verifier sharing → out of scope for v1

Workflow

• Branch from main via superpowers:using-git-worktrees: feat/plan-06-verifier-subtype-and-vitest.
• One PR closes this issue — include Closes #<this issue's number> in the PR description.
• Update docs/superpowers/plans/README.md to move this plan from "not started" to "shipped" in the same PR.
• Final step is the close-out commit and git tag v0.0.6-plan-06.
• All 5 quality gates apply (CONTRIBUTING.md).