- pytest.ini: 'integration' marker, deselected by default; the integration
suite requires a live Qdrant and will only run in the nightly CI job.
- src/indexer.py: move env validation from import time into _validate_config()
called by main() — the module can now be imported without MAILDIR_PATH /
QDRANT_URL / COLLECTION_NAME set, enabling unit tests.
- tests/test_indexer.py: 27 new unit tests, no network and no model:
decode_mime_words (encoded-words utf-8/iso-8859-1, mixed), extract_text_from_html
(tags, scripts), normalize_email_address, parse_email_message with real
EmailMessage objects (plain bodies, attachments detected and excluded from
body, HTML alternative, unknown charset fallback via raw bytes message,
encoded attachment filename), get_recent_keys against a real tmp_path
Maildir (fresh mtime selected, old mtime excluded, colon-suffix keys).
mailbox.Maildir(create=True) does not create cur/new/tmp on Python 3.11 —
the test helper pre-creates them.
