feat: maximize sorter demo realism and add safe agent MVP

Wire live classifyItem into continuous playback, add jam/E-stop cases,
presenter controls (seek/speed/hotkeys), quality modes, demo scripts,
audit docs, and a verify-only autonomous agent CLI with hard safety limits.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/data/resolveItem.ts

@@ -0,0 +1,29 @@
+/**
+ * Resolve playlist / scenario item ids, including low-confidence variants (SKU-*-LC).
+ */
+
+import type { Item } from '../domain/types';
+import { getItem, ITEMS } from './items';
+
+/** Strip -LC suffix and apply low confidence when present. */
+export function resolveItem(itemId: string): Item {
+  if (itemId.endsWith('-LC')) {
+    const baseId = itemId.slice(0, -3);
+    const base = getItem(baseId);
+    return {
+      ...base,
+      id: itemId,
+      confidence: Math.min(base.confidence, 0.58),
+    };
+  }
+  return getItem(itemId);
+}
+
+export function findItemOrFallback(itemId: string): Item {
+  try {
+    return resolveItem(itemId);
+  } catch {
+    const stripped = itemId.replace(/-LC$/, '');
+    return ITEMS.find((i) => i.id === stripped) ?? ITEMS[0];
+  }
+}