Restore archived tasks, fix dashboard scroll-reset, bind ornith, add Playwright smoke test

- **Restore 82 completed tasks** from tasks/complete/ back to tasks/ top
  level (all <7 days old per the cleanup policy; premature bulk archive
  was fixed).
- **Dashboard: fix scroll-reset on auto-refresh** — renderBoard rebuilds
  the board via innerHTML every 2s, destroying each column-body's
  scrollTop. Now snapshots column-body scrollTop + board.scrollLeft +
  view.scrollTop before rebuild and restores after (matched by
  PHASE_GROUPS index).
- **Dashboard UI additions** (pre-existing unstaged work): approval
  section cards, transition buttons, inline artifact editor (textarea for
  writing missing SPEC/VERDICT/etc from the detail modal).
- **Bind ornith as Implement model** — config.md: Model explicit to
  omlx/Ornith-1.0-35B-4bit-mlx, context window 32768. Interactive
  autopilot already used ornith via opencode default; now explicit.
- **Fix cleanup stub** — automaton-cleanup.sh had a stale --project arg
  pointing at a pytest temp dir (test isolation leak). Rewired to point
  at ~/.automaton.
- **Fix plist-isolation test** — test asserted host plist doesn't exist,
  but a real install creates it. Now snapshots mtime before run, asserts
  unchanged after (only a write during the test counts as bleed).
- **New Playwright smoke test** (tests/test_dashboard_ui.py) — 2 tests:
  board renders tasks, column scroll survives auto-refresh tick.
  Verified the test fails without the scroll fix (scrollTop resets to 0).
  Skipped via importorskip when playwright is absent (main CI stays
  green).
- **Clarify SI loop scope in README** — new-project onboarding section
  documents the framework-scoped self-improvement loop and options
  (leave/pause/create project loop).
- **CHANGELOG** documents all changes including the known model-divergence
  gap (mde tasks marked complete but per-role model binding was never
  implemented).

tasks/task-status-reason/IMPLEMENTATION.md

@@ -0,0 +1,17 @@
+# Implementation: Add Status Reason to Task Display
+
+## Summary
+Added `status_reason` property to `Task` model providing human-readable explanations for each task state, exposed it in API responses, displayed it prominently in the detail panel and on task cards. Fixed the pending review count to exclude terminal-state tasks. Replaced approve/request-changes buttons with revoke buttons when a review is already submitted.
+
+## Changes
+- `automaton/dashboard/core/task.py`: Added `status_reason` property on `Task` with explanations for all 10+ task states
+- `automaton/dashboard/ui/app.py`: Added `status_reason` to `_serve_tasks()` and `_serve_task()` JSON responses; accepted `"pending"` as valid review status
+- `automaton/dashboard/html/dashboard.js`: Displayed `status_reason` in detail panel and on task cards; fixed pending count to exclude done/blocked; added conditional button rendering for approved/changes_requested reviews
+- `automaton/dashboard/html/styles.css`: Added `.detail-status-reason` and `.task-card-reason` styles
+- `tests/test_task.py`: Added `TestStatusReason` class with 5 tests covering done, blocked, and in-progress states
+
+## Test Results
+156 passed
+
+## Blockers
+None