Implement replay-safe browser synchronization

web/src/sync/test-fixtures.ts

@@ -0,0 +1,93 @@
+import type { EventFrameDto, JobDto, ProgressDto } from '../api/contracts'
+
+export const observedAt = '2026-07-17T00:00:00Z'
+
+export function job(revision: number, overrides: Partial<JobDto> = {}): JobDto {
+  return {
+    resource_kind: 'job',
+    id: 'job_00000001',
+    owner: 'owner_000001',
+    label: 'Fixture job',
+    revision,
+    phase: 'Running',
+    lifecycle: 'visible',
+    source: {
+      kind: 'http',
+      display_url: 'https://example.invalid/archive',
+      result_path: 'archive.bin',
+    },
+    target: {
+      store: 'target-main',
+      bucket: 'fixture-bucket',
+      prefix: 'results',
+    },
+    authoritative_attempt: {
+      attempt_id: 'attempt_0001',
+      fence: 1,
+      worker_incarnation: 'worker_00001',
+    },
+    progress: progress(10),
+    checkpoint: null,
+    result: null,
+    failure: null,
+    created_at: observedAt,
+    updated_at: observedAt,
+    event_cursor: 'cursor-snapshot-0001',
+    ...overrides,
+  }
+}
+
+export function progress(completedBytes: number): ProgressDto {
+  return {
+    attempt_id: 'attempt_0001',
+    fence: 1,
+    completed_bytes: completedBytes,
+    total_bytes: 100,
+    completed_members: 0,
+    total_members: 1,
+    observed_at: observedAt,
+  }
+}
+
+export function jobChanged(
+  sequence: number,
+  eventId: string,
+  revision: number,
+  completedBytes: number,
+): EventFrameDto {
+  return {
+    schema_version: 1,
+    kind: 'job_changed',
+    event_id: eventId,
+    sequence,
+    cursor: `cursor-event-${String(sequence).padStart(4, '0')}`,
+    occurred_at: observedAt,
+    job_id: 'job_00000001',
+    job_revision: revision,
+    phase: 'Running',
+    lifecycle: 'visible',
+    authoritative_attempt: {
+      attempt_id: 'attempt_0001',
+      fence: 1,
+    },
+    progress: {
+      attempt_id: 'attempt_0001',
+      fence: 1,
+      completed_bytes: completedBytes,
+      total_bytes: 100,
+      completed_members: 0,
+      total_members: 1,
+    },
+  }
+}
+
+export function heartbeat(sequence: number, eventId: string): EventFrameDto {
+  return {
+    schema_version: 1,
+    kind: 'heartbeat',
+    event_id: eventId,
+    sequence,
+    cursor: `cursor-event-${String(sequence).padStart(4, '0')}`,
+    occurred_at: observedAt,
+  }
+}