- Add [lints.clippy] section to Cargo.toml with pedantic group
- Cherry-pick restriction lints: dbg_macro (deny), todo, unwrap_used, expect_used (warn)
- Allow noisy pedantic lints (missing_errors_doc, module_name_repetitions, etc.)
- Fix unnecessary Result wrappers in token and user repository to_domain functions
- Merge duplicate match arms in TimelineEventViewModel
- Add justified #[allow] attributes for startup code and tests
