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/complete/fix-migrate-find-precedence/CODE_REVIEW.md

@@ -0,0 +1,13 @@
+# Code Review: fix-migrate-find-precedence
+
+## Reviewed Files
+- `scripts/migrate-project.sh` (line 108)
+
+## Changes
+Added parentheses around `-name` tests in `find` command to ensure `-prune` binds to the entire OR-group.
+
+## Verdict: PASS
+
+The fix is correct and minimal. In POSIX `find`, `-a` (AND) has higher precedence than `-o` (OR), so without parentheses, `-prune` only applies to the last `-name` test. The parentheses ensure `-prune` applies to all three directories (`.git`, `node_modules`, `.automaton`).
+
+Verified with `bash -n scripts/migrate-project.sh` — syntax is valid.