ci: throwaway windows repro (not for merge)

Author: miguel-heygen

.github/workflows/zz-win-repro.yml

@@ -0,0 +1,50 @@
+name: zz-win-repro
+on:
+  push:
+    branches: [fix/ffmpeg-wrong-build-on-path]
+jobs:
+  repro:
+    runs-on: windows-latest
+    timeout-minutes: 25
+    steps:
+      - uses: actions/setup-node@v4
+        with: { node-version: 22 }
+      - name: ffmpeg
+        shell: pwsh
+        run: |
+          choco install ffmpeg -y --no-progress | Select-Object -Last 3
+          Get-Command ffmpeg, ffprobe | Format-Table Source
+      - name: project with audio
+        shell: pwsh
+        run: |
+          mkdir C:\w; cd C:\w
+          npx --yes hyperframes@0.8.204 init proj --example blank --non-interactive 2>&1 | Select-Object -Last 5
+          cd proj
+          ffmpeg -y -f lavfi -i "sine=frequency=440:duration=3" -c:a aac tone.m4a 2>&1 | Select-Object -Last 1
+          Get-ChildItem | Format-Table Name
+          Get-Content index.html | Select-Object -First 30
+      - name: A - audio render with delete denied on TEMP
+        shell: pwsh
+        continue-on-error: true
+        run: |
+          cd C:\w\proj
+          $t = "C:\w\tmpdeny"; mkdir $t | Out-Null
+          icacls $t /deny "${env:USERNAME}:(OI)(CI)(DE,DC)" | Out-Host
+          $env:TEMP = $t; $env:TMP = $t
+          '<audio id="a" src="tone.m4a" data-start="0" data-duration="3" data-track-index="2"></audio>' | Out-File -Encoding utf8 audio-snippet.txt
+          $h = Get-Content index.html -Raw
+          if ($h -notmatch 'tone.m4a') { $h = $h -replace '</div>\s*(<script|</body>)', "<audio id=`"a`" src=`"tone.m4a`" data-start=`"0`" data-duration=`"3`" data-track-index=`"2`"></audio></div>`$1"; Set-Content index.html $h }
+          npx --yes hyperframes@0.8.204 render . -o out-a.mp4 --fps 30 2>&1 | Select-Object -Last 25
+          Get-Item out-a.mp4 -ErrorAction SilentlyContinue | Format-Table Name, Length
+      - name: B - fake ffprobe first on PATH and in cwd
+        shell: pwsh
+        continue-on-error: true
+        run: |
+          cd C:\w\proj
+          mkdir C:\w\fake | Out-Null
+          '@echo off' + "`r`n" + 'echo ffprobe version 2.8.0 fake' | Set-Content C:\w\fake\ffprobe.cmd
+          Copy-Item C:\w\fake\ffprobe.cmd .\ffprobe.cmd
+          $env:PATH = "C:\w\fake;" + $env:PATH
+          Get-Command ffprobe | Format-Table Source
+          npx --yes hyperframes@0.8.204 doctor 2>&1 | Select-Object -Last 20
+          npx --yes hyperframes@0.8.204 render . -o out-b.mp4 --fps 30 2>&1 | Select-Object -Last 25