feat(ux): reorganize command groups and add Tufte-inspired help styling

- Add semantic coloring to help output (section headers, flags, types)
- Reorganize commands into clearer categories:
  - "Views & Reports" for readonly queries (ready, stats, blocked, etc.)
  - "Maintenance" for health/repair tasks (doctor, validate, migrate, etc.)
  - Merge "Issue Metadata" back into "Working With Issues"
- Highlight "doctor" as primary maintenance entry point with "(start here)"
- Create docs/UI_PHILOSOPHY.md documenting Tufte-inspired design principles
- Add guidance for PR to not include .beads/issues.jsonl

CLAUDE.md

@@ -857,3 +857,8 @@ For more details, see README.md and docs/QUICKSTART.md.
 - NEVER stop before pushing - that leaves work stranded locally
 - NEVER say "ready to push when you are" - YOU must push
 - If push fails, resolve and retry until it succeeds
+
+
+## Pull Requests (PR)
+
+- Make sure that .beads/issues.jsonl is never submitted during PRs; revert the changes to .beads/issues.jsonl on the branch.