[ci] Temporary: prove ESP-IDF spaced-path compile failure on Windows

.github/workflows/zz-windows-spaces-probe.yml

@@ -0,0 +1,49 @@
+# Temporary workflow: proves the ESP-IDF spaced-path compile bug on Windows.
+# Removed in the final commit of this PR; must never land on dev.
+name: zz Windows spaced-path probe (temporary)
+
+on:
+  push:
+    branches:
+      - esp32-idf-spaces-path-fix
+  workflow_dispatch:
+
+permissions:
+  contents: read
+
+jobs:
+  esp-idf-spaced-path:
+    name: ESP-IDF compile from a path with a space
+    runs-on: windows-latest
+    steps:
+      - name: Check out code from GitHub
+        uses: actions/checkout@df4cb1c069e1874edd31b4311f1884172cec0e10 # v6.0.3
+      - name: Set up Python
+        uses: actions/setup-python@a309ff8b426b58ec0e2a45f0f869d46889d02405 # v6.2.0
+        with:
+          python-version: "3.11"
+      - name: Install esphome
+        shell: bash
+        run: |
+          python -m pip install -U pip
+          pip install -e .
+      - name: Write a minimal ESP-IDF config into a directory with a space
+        shell: bash
+        run: |
+          mkdir -p "first last"
+          cat > "first last/probe.yaml" <<'EOF'
+          esphome:
+            name: spaces-probe
+          esp32:
+            board: esp32dev
+            framework:
+              type: esp-idf
+          logger:
+          EOF
+          echo "Config dir (note the space):"
+          pwd
+          ls -la "first last"
+      - name: Compile from the spaced path
+        shell: bash
+        run: |
+          esphome compile "first last/probe.yaml"