v0.2.0 — --outline and --group modes

v0.2.0 — --outline and --group modes

New output modes for further agent-token reduction beyond --compact:

• --outline: one signature line per chunk (100% well-formed, no truncation)
• --group: directory grouping + match lines capped at 3 per chunk

Measured on 33 queries against the semble_rs repo:
--outline: -47.1% vs --compact
--group: -46.7% vs --compact

Recommended workflow:

1. --outline for first-pass structural scan
2. --compact for matching-line context
3. --json --strip when chunk bodies are required