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/add-post-commit-autopilot-driver/SPEC.md

@@ -1,20 +0,0 @@
-# SPEC: Add Post-Commit Autopilot Driver Reminder
-
-## Problem
-When autopilot is enabled, tasks can be left hanging after commits. There's no
-automated reminder to drive them to completion.
-
-## Requirements
-1. Create a post-commit hook at `scripts/git-hooks/post-commit`
-2. After a commit succeeds, check if autopilot is enabled (.agent.md)
-3. If autopilot is enabled and non-terminal tasks exist, output a summary:
-   - Number of non-terminal tasks
-   - Their current phases
-   - Clear instruction: "Run the orchestrator to drive them to completion"
-4. Exit 0 always (informational only, never blocks)
-
-## Acceptance Criteria
-- Post-commit hook exists and is executable
-- Hook output is silent when no work remains or autopilot is off
-- Hook prints actionable summary when work exists and autopilot is on
-- bash -n passes syntax check