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/hook-install-process/IMPLEMENTATION.md

@@ -1,27 +0,0 @@
-# Implementation: Hook Installation in Onboarding and Upgrade
-
-## Changes
-
-### 1. prompts/onboarding.md — Step 2c: Pre-Commit Hook Installation
-- Added Step 2c between VRAM config and Output sections
-- Checks for `.git/hooks/` directory
-- Creates symlink from `.git/hooks/pre-commit` to `~/.automaton/scripts/git-hooks/pre-commit`
-- Warns if existing hook is not our symlink
-- Verifies hook works with `status.py --can-edit`
-
-### 2. scripts/upgrade.sh — Hook installation during upgrade
-- Added after the "Upgrade Complete" message
-- Detects `.git/hooks/` directory
-- If hook doesn't exist: creates symlink
-- If hook is already our symlink: reports "already linked"
-- If hook exists but is not our symlink: warns user, prints manual install command
-- If no `.git/hooks/`: prints note with manual install command
-
-### 3. scripts/install.sh — Post-install next steps
-- Replaced single "Next step" with numbered list
-- Added hook installation as step 2
-- Added explanation of what the hook does
-
-## Tests
-- All 200 tests pass
-- Shell syntax checks pass for install.sh and upgrade.sh