feat(cli): add --repo and --exclude filtering (fixes #5)

Add argparse-based CLI parsing with repeatable --repo/-r (include) and
--exclude/-x (exclude) options. Filtering is case-insensitive substring
matching, applied post-fetch in collect_all() per ADR-005.

- parse_args() separated from main() for testability
- main(argv=None) accepts argv for test injection
- collect_all() gains optional include/exclude parameters
- 14 new tests (8 filtering + 6 CLI parsing/integration)
- All 51 tests pass, backward compatible (no args = v1.0.0 behavior)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

CHANGELOG.md

@@ -6,6 +6,12 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/).
 
 ## [Unreleased]
 
+### Added
+
+- Options CLI `--repo`/`-r` et `--exclude`/`-x` pour filtrer les repos par nom (sous-chaine, insensible a la casse)
+- Parsing CLI via argparse avec `parse_args()` separee pour testabilite
+- Parametres `include`/`exclude` dans `collect_all()` pour filtrage post-fetch
+
 ## [1.0.0] - 2026-03-10
 
 ### Added