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/push-to-gitea/SPEC.md

@@ -0,0 +1,11 @@
+# Push to Gitea
+
+## Goal
+Push latest changes to the gitea remote.
+
+## Changes
+- README.md: v2.0 documentation (project flag, can-edit modes, upgrade, enforcement)
+- scripts/status.py: fix _infer_state_from_artifacts heuristic, fix cmd_validate_folder corrupted state
+- scripts/upgrade.sh: remove || true, add python3 check, use git rev-parse --git-dir
+- tests/test_status.py: 6 new tests
+- Task artifacts for hook-install-process, readme-upgrade-docs, pre-existing-fixes