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/developer-experience-gitea-ci/IMPLEMENTATION.md

@@ -1,22 +0,0 @@
-# Implementation: Developer Experience and Gitea CI
-
-## Summary
-Improved framework maintainability by adding contributor documentation, Gitea CI, packaging configuration, and cleaning up unused template files.
-
-## Files Changed
-- `AGENTS.md` (new)
-- `.gitea/workflows/ci.yml` (new)
-- `templates/contract-template.md` (deleted)
-- `templates/README.md` (new)
-- `CHANGELOG.md` (updated with all recent changes)
-- `pyproject.toml` (root config created in Task 3)
-
-## Verification
-- `AGENTS.md` contains build/test commands and conventions.
-- `.gitea/workflows/ci.yml` references the correct test commands.
-- `templates/contract-template.md` no longer exists.
-
-## Decisions
-- Gitea is the CI platform (matches existing infrastructure).
-- CI runs py_compile, pytest, and bash syntax checks.
-- Unused contract template removed; remaining templates documented.