feat: scenario validator + AFTERIMAGE pilot data

src/core/scenario.js

@@ -0,0 +1,15 @@
+export function validateScenario(s) {
+  if (!s || typeof s !== 'object') return ['scenario must be an object'];
+  const errors = [];
+  if (!s.meta?.id) errors.push('meta.id required');
+  if (!s.meta?.system) errors.push('meta.system required');
+  if (!Array.isArray(s.timeline) || s.timeline.length === 0) {
+    errors.push('timeline must be a non-empty array');
+  } else {
+    s.timeline.forEach((b, i) => {
+      if (!b.id) errors.push(`timeline[${i}].id required`);
+      if (typeof b.targetMin !== 'number') errors.push(`timeline[${i}].targetMin must be a number`);
+    });
+  }
+  return errors;
+}

src/scenarios/afterimage.js

@@ -0,0 +1,14 @@
+export default {
+  meta: { id: 'afterimage', title: 'AFTERIMAGE', system: 'year-zero', players: 4, playMinutes: 210, slot: 'Fri · Slot 2' },
+  timeline: [
+    { id: 'a1-open',    act: 1, label: 'The pier — the case lands', targetMin: 0,   hardTrigger: true },
+    { id: 'a1-parlor',  act: 1, label: 'Parlor 88 interview',       targetMin: 35,  cutHint: 'Summarise the ledger; skip the tea ritual' },
+    { id: 'a2-market',  act: 2, label: 'The Market',                targetMin: 90 },
+    { id: 'a2-doorcam', act: 2, label: 'Door-cam reveal',           targetMin: 120, hardTrigger: true, notes: 'The pivot — do not let this slip past 2:15' },
+    { id: 'a3-pier',    act: 3, label: 'Pier confrontation',        targetMin: 175, hardTrigger: true },
+    { id: 'epilogue',   act: 4, label: 'Baseline / ambiguous end',  targetMin: 200 },
+  ],
+  clues: [],
+  cast: [],
+  props: [],
+};

tests/core/scenario.test.js

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+import { describe, it, expect } from 'vitest';
+import { validateScenario } from '../../src/core/scenario.js';
+import afterimage from '../../src/scenarios/afterimage.js';
+import { getRulePack } from '../../src/dice/rulepacks/index.js';
+
+describe('scenario validation', () => {
+  it('flags missing required fields', () => {
+    expect(validateScenario(null)).toContain('scenario must be an object');
+    const errs = validateScenario({ meta: {}, timeline: [] });
+    expect(errs).toContain('meta.id required');
+    expect(errs).toContain('meta.system required');
+    expect(errs).toContain('timeline must be a non-empty array');
+  });
+
+  it('flags a beat missing targetMin', () => {
+    const errs = validateScenario({ meta: { id: 'x', system: 'year-zero' }, timeline: [{ id: 'a' }] });
+    expect(errs).toContain('timeline[0].targetMin must be a number');
+  });
+
+  it('accepts the AFTERIMAGE pilot and its system resolves', () => {
+    expect(validateScenario(afterimage)).toEqual([]);
+    expect(afterimage.meta.system).toBe('year-zero');
+    expect(getRulePack(afterimage.meta.system)).not.toBe(null);
+    expect(afterimage.timeline.length).toBeGreaterThan(3);
+  });
+});