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/IMPLEMENTATION.md

@@ -0,0 +1,20 @@
+# Implementation: fix-migrate-find-precedence
+
+## Bug
+`migrate-project.sh` uses `find` without parentheses around `-name` tests combined with `-prune`, causing `-prune` to bind only to the last `-name` test. This results in incorrect pruning — some directories that should be pruned are still traversed.
+
+## Fix
+Added parentheses around the `-name` tests in the `find` command at `scripts/migrate-project.sh:108`:
+
+```diff
+- find . -name .git -o -name node_modules -o -name .automaton -prune ...
++ find . \( -name .git -o -name node_modules -o -name .automaton \) -prune ...
+```
+
+This ensures `-prune` applies to the entire OR-group, not just the last `-name` test.
+
+## Files Changed
+- `scripts/migrate-project.sh` (line 108): added `\(` and `\)` around the `-name` group
+
+## Tests
+No new tests added — shell script syntax change only. Verified with `bash -n scripts/migrate-project.sh`.