Add MVP demo interview runbook

mvp/demo/scripts/run-payment-timeout-demo.ps1

@@ -0,0 +1,54 @@
+param(
+    [string]$BaseUrl = "http://localhost:9900",
+    [string]$SessionId = "mvp-demo-payment-timeout-001",
+    [string]$RequestFile = "$PSScriptRoot/../requests/payment-timeout-chat.json",
+    [string]$OutputDir = "$PSScriptRoot/../output"
+)
+
+$ErrorActionPreference = "Stop"
+
+New-Item -ItemType Directory -Force -Path $OutputDir | Out-Null
+
+$request = Get-Content -Raw -Encoding UTF8 -Path $RequestFile | ConvertFrom-Json
+$request.Id = $SessionId
+$body = $request | ConvertTo-Json -Depth 8
+
+Write-Host "Running payment-timeout chat demo..."
+Write-Host "BaseUrl: $BaseUrl"
+Write-Host "SessionId: $SessionId"
+
+$chat = Invoke-RestMethod `
+    -Method Post `
+    -Uri "$BaseUrl/api/chat" `
+    -ContentType "application/json; charset=utf-8" `
+    -Body $body
+
+$chat | ConvertTo-Json -Depth 20 | Set-Content -Encoding UTF8 -Path "$OutputDir/chat-response.json"
+Write-Host "Saved chat response: $OutputDir/chat-response.json"
+
+$trace = Invoke-RestMethod `
+    -Method Get `
+    -Uri "$BaseUrl/api/diagnosis/$SessionId/trace"
+
+$trace | ConvertTo-Json -Depth 50 | Set-Content -Encoding UTF8 -Path "$OutputDir/trace-response.json"
+Write-Host "Saved trace response: $OutputDir/trace-response.json"
+
+$feedbackBody = @{
+    sessionId = $SessionId
+    feedback = "useful"
+} | ConvertTo-Json
+
+$feedback = Invoke-RestMethod `
+    -Method Post `
+    -Uri "$BaseUrl/api/feedback" `
+    -ContentType "application/json; charset=utf-8" `
+    -Body $feedbackBody
+
+$feedback | ConvertTo-Json -Depth 20 | Set-Content -Encoding UTF8 -Path "$OutputDir/feedback-response.json"
+Write-Host "Saved feedback response: $OutputDir/feedback-response.json"
+
+Write-Host ""
+Write-Host "Demo completed. Review:"
+Write-Host "- mvp/demo/output/chat-response.json"
+Write-Host "- mvp/demo/output/trace-response.json"
+Write-Host "- mvp/demo/output/feedback-response.json"