Full optimization: 38 improvements across frontend, backend, infrastructure, and docs

Frontend (17 items):
- Virtualized message list with batch loading
- CSS split with skeleton, drawer, search filter, message action styles
- Code splitting via React.lazy + Suspense for Admin/Ethics/Settings pages
- Skeleton loading components (Skeleton, SkeletonCard, SkeletonGrid)
- Debounced search/filter component (SearchFilter)
- Error boundary with fallback UI
- Keyboard shortcuts (Ctrl+K search, Ctrl+Enter send, Escape dismiss)
- Page transition animations (fade-in)
- PWA support (manifest.json + service worker)
- WebSocket auto-reconnect with exponential backoff (10 retries)
- Chat history persistence to localStorage (500 msg limit)
- Message edit/delete on hover
- Copy-to-clipboard on code blocks
- Mobile drawer (bottom-sheet for consensus panel)
- File upload support
- User preferences sync to backend

Testing (8 items):
- Component tests: Toast, Markdown, ChatMessage, Avatar, ErrorBoundary, Skeleton
- Hook tests: useChatHistory
- E2E smoke tests (5 tests)
- Accessibility audit utility

Backend (12 items):
- Vector memory with cosine similarity search
- TTS/STT adapter factory wiring
- Geometry kernel with orphan detection
- Tenant registry with CRUD operations
- Response cache with TTL
- Connection pool (async)
- Background task queue
- Health check endpoints (/health, /ready)
- Request tracing middleware (X-Request-ID)
- API key rotation mechanism
- Environment-based config (settings.py)
- API route documentation improvements

Infrastructure (4 items):
- Grafana dashboard template
- Database migration system
- Storybook configuration

Documentation (3 items):
- ADR-001: Advisory Governance Model
- ADR-002: Twelve-Head Architecture
- ADR-003: Consequence Engine

552 Python tests + 45 frontend tests passing, 0 ruff errors.

Co-Authored-By: Nakamoto, S <defi@defi-oracle.io>

tests/test_migration.py

@@ -0,0 +1,47 @@
+"""Tests for migration system."""
+
+import os
+import sqlite3
+import tempfile
+
+from migrations.migrate import migrate_down, migrate_up
+
+
+def test_migrate_up():
+    with tempfile.NamedTemporaryFile(suffix=".db", delete=False) as f:
+        db_path = f.name
+    try:
+        count = migrate_up(db_path)
+        assert count >= 1
+        conn = sqlite3.connect(db_path)
+        tables = conn.execute("SELECT name FROM sqlite_master WHERE type='table'").fetchall()
+        table_names = [t[0] for t in tables]
+        assert "sessions" in table_names
+        assert "ethical_lessons" in table_names
+        assert "consequences" in table_names
+        conn.close()
+    finally:
+        os.unlink(db_path)
+
+
+def test_migrate_down():
+    with tempfile.NamedTemporaryFile(suffix=".db", delete=False) as f:
+        db_path = f.name
+    try:
+        migrate_up(db_path)
+        result = migrate_down(db_path)
+        assert result is True
+    finally:
+        os.unlink(db_path)
+
+
+def test_migrate_idempotent():
+    with tempfile.NamedTemporaryFile(suffix=".db", delete=False) as f:
+        db_path = f.name
+    try:
+        count1 = migrate_up(db_path)
+        count2 = migrate_up(db_path)
+        assert count1 >= 1
+        assert count2 == 0
+    finally:
+        os.unlink(db_path)