Merge branch 'emdash/shy-items-fry-f4zze' into refactor/mvp1.0

# Conflicts:
#	mvp/issues/README.md

mvp/demo/README.md

@@ -2,6 +2,13 @@
 
 This demo proves the MVP flow from user question to persisted diagnosis trace.
 
+For interview use, start with:
+
+- `interview-walkthrough.md` for the talk track
+- `trace-inspection-checklist.md` for fields to inspect
+- `scripts/run-payment-timeout-demo.ps1` for the runnable local demo
+- `requests/payment-timeout-chat.json` for the fixed request payload
+
 ## Prerequisites
 
 - MySQL, Redis, Milvus/Zilliz, and LLM/embedding configuration are available through the current project configuration.
@@ -22,6 +29,22 @@ http://localhost:9900
 
 ## 1. Run Chat Diagnosis
 
+Fast path:
+
+```powershell
+powershell -ExecutionPolicy Bypass -File mvp/demo/scripts/run-payment-timeout-demo.ps1
+```
+
+This writes:
+
+```text
+mvp/demo/output/chat-response.json
+mvp/demo/output/trace-response.json
+mvp/demo/output/feedback-response.json
+```
+
+Manual path:
+
 ```powershell
 $sessionId = "mvp-demo-payment-timeout-001"
 $body = @{