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/fix-verdict-pass-inference/ADVERSARIAL_BUG_REPORT.md

@@ -1,18 +0,0 @@
-# Adversarial Bug Report: fix-verdict-pass-inference
-
-## Summary
-Adversarial review of the verdict parsing fix. One minor edge case noted (already in bug report).
-
-## Bugs Found
-No additional bugs beyond Bug 1 in BUG_REPORT.md (substring match within status value — Low severity, consistent with dashboard).
-
-## Analysis
-- **Consistency with dashboard**: The new `_parse_verdict_status_line()` mirrors `task.py:parse_verdict_status()` — both use the same `label in after_colon.upper()` pattern. This is deliberate alignment, not a bug.
-- **Fallback behavior**: Unparseable verdicts now return `"human_intervention"` instead of the old implicit behavior. This is safer — a verdict that can't be parsed should never be assumed PASS.
-- **Edge case — multiple status lines**: If a verdict has both `## Status: FAIL` and later `## Status: PASS`, the first match wins (FAIL). This is correct — the first status declaration is the authoritative one.
-- **Edge case — case variations**: `## status: pass` (lowercase) is handled by `low.startswith("## status")` and `after_colon.upper() == "PASS"` — correct.
-
-## Score
-0
-
-ADVERSARIAL_BUG_FIND_COMPLETE