feat(demo): add interview quality audit

mvp/eval/README.md

@@ -29,10 +29,10 @@ The baseline evaluates saved trace fixtures. It does not start the application a
 The committed baseline currently contains:
 
 ```text
-10 fixed cases
-10 passing fixture evaluations
-4 PASS verdicts
-5 LOW_CONFID verdicts
+12 fixed cases
+12 passing fixture evaluations
+5 PASS verdicts
+6 LOW_CONFID verdicts
 1 REJECT verdict
 ```
 
@@ -44,6 +44,8 @@ The V2 evidence-pipeline matrix covers:
 - Unsupported claim filtering before the final answer.
 - Composer fallback rendering without raw Executor JSON leakage.
 - Gatekeeper rule set version audit for new matrix fixtures.
+- Prompt audit version checks for planner, executor, verifier, and composer prompts.
+- Gatekeeper rule metadata checks for enabled rule id and default severity.
 
 ## Verification
 
@@ -80,6 +82,8 @@ Stage 5 adds these V2 checks:
 - `claim_checks` must be structurally auditable.
 - Composer output must record whether normal parsing or fallback rendering was used.
 - Gatekeeper rule set version can be asserted per fixture.
+- Prompt audit version and per-prompt versions can be asserted per fixture.
+- Gatekeeper rule metadata can be required per fixture.
 - Final answers must not leak raw Executor protocol markers such as `executor_evidence_v2`, `answer_version`, `evidence_bindings`, or `claim_id`.
 - Configured unsupported claim keywords must not appear as confirmed final-answer content.