The [calendar] config keys existed without explanation. Document enabling
CalDAV sync end to end: finding the collection URL, creating an app password,
the config block, and the best-effort sync behaviour.
- Add MIT LICENSE file
- Expand .gitignore with standard Rust/Linux entries
- Remove dangling symlinks (breadmancli, breadpadcli) and dev scratchpad (svgs.txt) from git tracking
- Replace unsafe unwrap() calls with expect() in breadman CLI (guarded by prior filter)