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/Cargo.toml

@@ -5,6 +5,7 @@ edition.workspace = true
 license.workspace = true
 authors.workspace = true
 
+
 [dependencies]
 anyhow.workspace = true
 tracing.workspace = true