Archive completed tasks, add cleanup commands, self-documenting dashboard UI

- Archive 79 completed framework-dev tasks from tasks/ -> tasks/complete/
- status.py: add --cleanup-done and --install-cleanup-schedule commands
- Add scripts/automaton-cleanup.sh for periodic task archiving
- Dashboard: rename 'Background' tab -> 'Agent', 'Cleanup' agent -> 'Completed Task Archiver', remove redundant group headers and pill badges, dim inactive agent placeholders
- .rules.md: add Self-Documenting UI Names rule
- New tests: test_cleanup_done.py, expanded test_app.py and test_task.py

tasks/state-file-enforcement/BUG_REPORT.md

@@ -1,22 +0,0 @@
-# Bug Report: State File Enforcement
-
-## Methodology
-Reviewed status.py implementation of .state file format, approval sub-states, atomic writes, forbidden artifacts per phase, task creation gate, and state transition rules.
-
-## Acceptance Criteria
-| # | Criterion | Result |
-|---|-----------|--------|
-| 1 | `.state` file format with approval sub-states | ✅ |
-| 2 | Atomic write mechanism (tmp+rename) | ✅ |
-| 3 | Forbidden artifacts per phase enforced | ✅ |
-| 4 | `--validate-folder` flags folders without `.state` | ✅ |
-| 5 | `--audit` flags manually created task folders | ✅ |
-| 6 | Task creation gate (`--create-task`) | ✅ |
-| 7 | Approval sub-states for research/design/decompose/test_design | ✅ |
-| 8 | `:awaiting_approval` → `:approved` only via `--approve` | ✅ |
-| 9 | `.state` excluded from artifact heuristics | ✅ |
-
-## Findings
-1. **Minor**: The `.gitignore` pattern for `.state` was not explicitly added to a project-level gitignore — it's documented as metadata but not enforced in version control.
-
-## Verdict: PASS