Prepare repo for GitHub publication

- 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)

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

breadpad-shared/src/lib.rs

@@ -7,3 +7,4 @@ pub mod scheduler;
 pub mod store;
 pub mod theme;
 pub mod types;
+pub mod util;