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-detail-modal/IMPLEMENTATION.md

@@ -0,0 +1,28 @@
+# Implementation: Centered Modal for Task Detail
+
+## Summary
+
+Replaced the narrow sliding side panel with a centered modal overlay for viewing task details.
+
+## Changes Made
+
+### `index.html`
+- Replaced `.detail-panel` fixed sidebar with `.modal-overlay` + `.modal-panel` container
+- Added `#btn-close-detail` button and backdrop click handler
+
+### `dashboard.js`
+- Updated all JS references from `detail-panel` to `detail-overlay`
+- `closeDetail()` hides overlay instead of sliding panel
+- Escape key handler added for modal close
+- Backdrop click closes modal
+
+### `styles.css`
+- `.modal-overlay` — fixed fullscreen backdrop with blur
+- `.modal-panel` — centered container, 720px max-width, 85vh max-height
+- Removed `.detail-panel` fixed positioning styles
+- Scrollable content within modal
+
+## Files Modified
+- `automaton/dashboard/html/index.html` — modal overlay structure
+- `automaton/dashboard/html/dashboard.js` — modal open/close logic
+- `automaton/dashboard/html/styles.css` — modal styling