[theomonnom]

• Skip common dependency, cache, build, and coverage directories.
• Honor Git-ignored directories, including custom Cargo output paths.
• Use WalkDir to avoid statting every file.
• Import the Python SDK once; show import hints from the worker process.
• Avoid a separate Python process for dev-channel version detection.
• Overlap watcher setup with Python startup.
• Watch project source, including modules outside the entrypoint directory.
• Preserve the 500 ms reload debounce.
• Keep two focused regressions for single imports and watcher exclusions.