pub fn project_runtime_dir(cwd: &Path) -> Result<PathBuf>Expand description
Resolve the per-cwd .spool/ directory used to buffer hook
signals (distill queue, last-prompt timestamp, …).
The directory is created on demand. We deliberately scope it under
the project repo (<cwd>/.spool/) rather than under $HOME so that
(a) signals stay attached to the project the user is currently
working on, and (b) git clean / project relocation naturally
resets the queue.