/plan-pipeline:validate: 2-Layer Validation

Independently validate the plan produced by /plan-pipeline:start. No code is written. Run /clear after this command before running /plan-pipeline:execute.

Validation is separate from planning by design: validators that didn't write the plan are not anchored to its assumptions.

Prerequisite

A committed plan file must exist at docs/plans/plan-{name}.md. If multiple plans exist, list them and ask the user which to validate.

Layer 1: Structural Validation

Run immediately, no agents required. Check the plan document for: