v0.2.3

feat: ingest shows current file in progress + graceful Ctrl-C (#6)

- on_progress gains the current file (relative posix path); the progress
  bar description updates in place to "Indexing <…/file.md>" (truncated to
  the useful tail) so you can see where it is without a scrolling list.
- Ctrl-C during ingest now prints a clean "Aborted. The index is safe —
  re-run `qkb ingest --full` to resume." and exits 130, instead of Click's
  bare "Aborted!". (An interrupted --full is already recoverable via the
  in-progress sentinel; nothing is corrupted.)

210 unit tests pass. Version 0.2.3.


Claude-Session: https://claude.ai/code/session_01TnBf6NQWckc7q1sUXnstG7

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>