Release 0.7.4

[jamietre]

Bump version to 0.7.4 and update CHANGELOG.

Summary

• File logging for find-watch/find-scan (daily rotating log files)
• SQLite page cache limits (blobs.db and source DBs capped at 16 MB)
• Fix spurious mass reindex on Windows directory Modify events
• no_wrap_extensions config — exempt file types from server-side word-wrap; formatter-matched extensions automatically exempt
• Pre-existing clippy lint fixes (collapsible_match, sort_by_key)