The sync command's stage spinners now show real-time aggregate progress
for each pipeline phase instead of static "syncing..." messages.
- Add `progress_callback` parameter to `run_embed` and
`run_generate_docs` so callers can receive `(processed, total)` updates
- Add `stage_bar` parameter to `run_ingest` for aggregate progress
across concurrently-ingested projects using shared AtomicUsize counters
- Update `stage_spinner` to use `{prefix}` for the `[N/M]` label,
allowing `{msg}` to be updated independently with progress details
- Thread `ProgressBar` clones into each concurrent project task so
per-entity progress (fetch, discussions, events) is reflected on the
aggregate spinner
- Pass `None` for progress callbacks at standalone CLI entry points
(handle_ingest, handle_generate_docs, handle_embed) to preserve
existing behavior when commands are run outside of sync
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>