feat(demo): add interview quality audit

devflow/projects/2026-07-09-interview-demo-quality-audit/decisions.md

@@ -89,3 +89,23 @@ Architecture risk assessment:
 
 - Commit completed.
 - Apply is authorized by the original objective: "完成后归档提交".
+
+## Pre-apply Research
+
+- Capability source: sm-flow built-in apply protocol. `openspec-apply-change` was not invoked directly in this session.
+- Repository semantic search/LSP note: the requested `codebase-retrieval` and LSP tools were not available in the exposed toolset, so impact analysis used `rg`, direct file reads, OpenSpec/devflow artifacts, and targeted tests.
+- Reference implementation and reuse:
+  - `ChatService.persistVerifierEvaluation(...)` is the single persistence point for Chat verifier/composer audit data; prompt audit was added there to cover normal, fallback, and degraded Composer paths.
+  - `DiagnosisTraceEvaluator` and `DiagnosisEvalReportWriter` are the deterministic eval extension points; no LLM judge was introduced.
+  - `mvp/demo/scripts/run-payment-timeout-demo.ps1` provided the request/trace/feedback flow reused by the new interview preflight script.
+- Interface impact remains L2 internal trace contract: `verifier_evaluation.prompt_audit` and eval report fields are added; no public endpoint, table, or request DTO changed.
+
+## Apply Notes
+
+- Added compact Chat prompt audit metadata: `chat-prompts-v1`, with planner/executor/verifier/composer prompt versions and resource paths.
+- Extended diagnosis eval schema, result reporting, baseline fixtures, JSON report, and Markdown report for Prompt audit and Gatekeeper rule metadata.
+- Added two fixture-backed audit cases:
+  - `prompt-gatekeeper-audit-closure`
+  - `audit-metadata-low-confid`
+- Added `mvp/demo/scripts/run-interview-demo-check.ps1` to run service readiness, Chat, Trace, feedback, and summary output.
+- Updated MVP demo/eval/architecture docs to explain `prompt_audit.version`, `gatekeeper_result.rule_set_version`, and deterministic fixture baseline.