refactor: deep code review improvements

- Add *.log to .gitignore, remove debug.log from tracking
- Fix dev-mode FS scan to discover .ts adapter files (not just .js)
- Deduplicate CONNECT_TIMEOUT: browser.ts now uses runtime.ts constant
- Fix CSV output: escape newlines in field values per RFC 4180
- Add proper type interfaces for validate/verify (remove any types)
- Remove unused hadOuterQuotes variable in snapshotFormatter
- Derive CliOptions from CliCommand via Omit+Partial to reduce duplication
- Expand dense one-liner action callbacks in main.ts for readability