Add Windows-only garage capture via MITM proxy and ADB automation

capture.toml.example

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+# Example configuration for `cargo run --bin capture`.
+# Copy to capture.toml and adjust to your machine; capture.toml is gitignored.
+#
+# The capture binary is Windows-only (BlueStacks + adb interception); on Unix
+# hosts it builds as a stub that exits with an error message.
+
+[device]
+# BlueStacks ADB endpoint (BlueStacks Settings -> Advanced -> Android Debug Bridge)
+serial = "127.0.0.1:5555"
+# How long to wait for the emulator to come online before giving up
+wait_secs = 180
+
+[paths]
+# Path to adb.exe (empty = auto-detect from LOCALAPPDATA, then PATH)
+adb = 'C:\Users\<you>\AppData\Local\Android\Sdk\platform-tools\adb.exe'
+# Path to the BlueStacks player, started automatically if the device is offline
+bluestacks = 'C:\Program Files\BlueStacks_nxt\HD-Player.exe'
+# Where the captured garage document is written
+output = 'my_cars.json'
+
+[proxy]
+# Local port for the MITM proxy (must be free; close HTTP Toolkit first)
+port = 8080
+
+[capture]
+# How long to wait for the game to boot and issue the sync request
+timeout_secs = 300
+# Per-request timeout when re-issuing the stored sync request (`capture replay`)
+replay_timeout_secs = 30