feat: build a static event feed from fixtures

Emits exactly the shape GET /api/events.json will serve, so the client can
be developed against real parsed data before the server and database land.
Reads fixtures only, never the network.

Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>

.gitignore

@@ -117,3 +117,6 @@ dist
 
 # runtime data
 data/
+
+# build output
+public/

scripts/build-feed.ts

@@ -0,0 +1,90 @@
+/**
+ * Build the static event feed from checked-in fixtures.
+ *
+ * Offline: this reads fixtures, never the network. It exists so the client can
+ * be developed and demoed against real parsed data before the server and
+ * database land, and it emits exactly the shape `GET /api/events.json` will.
+ *
+ *   bun run build:feed
+ */
+import { ADAPTERS } from "../src/ingest/adapters/index.ts";
+import { mergeEvents } from "../src/ingest/merge.ts";
+import { EventFeed, SCHEMA_VERSION, type SourceHealth } from "../src/shared/feed.ts";
+import type { GachaEvent, GameId } from "../src/shared/schema.ts";
+
+const OUT = "public/data/events.v1.json";
+
+/** Newest fixture per adapter. */
+async function latestFixture(adapterId: string, game: GameId) {
+  const glob = new Bun.Glob(`fixtures/${game}/*.html`);
+  const files = [...glob.scanSync(".")].sort();
+  const file = files.at(-1);
+  if (file === undefined) {
+    throw new Error(`no fixture found for ${adapterId} (fixtures/${game}/*.html)`);
+  }
+  return { file, html: await Bun.file(file).text() };
+}
+
+const now = new Date().toISOString();
+const byGame = new Map<GameId, GachaEvent[][]>();
+const sources: SourceHealth[] = [];
+
+for (const adapter of ADAPTERS) {
+  const { file, html } = await latestFixture(adapter.id, adapter.game);
+  const events = adapter.parse(html, {
+    now,
+    sourceUrl: adapter.url,
+    sourceId: adapter.id,
+    game: adapter.game,
+  });
+
+  const groups = byGame.get(adapter.game) ?? [];
+  groups.push(events);
+  byGame.set(adapter.game, groups);
+
+  sources.push({
+    sourceId: adapter.id,
+    game: adapter.game,
+    url: adapter.url,
+    // Fixture capture date stands in for a real fetch timestamp until the
+    // scheduler exists. The UI's staleness badge reads this, so it must not
+    // claim to be fresher than the data actually is.
+    lastSuccessAt: fixtureDate(file),
+    eventCount: events.length,
+  });
+
+  console.log(`  ${adapter.id.padEnd(24)} ${String(events.length).padStart(3)} events  ← ${file}`);
+}
+
+const events: GachaEvent[] = [];
+let conflictCount = 0;
+for (const [, groups] of byGame) {
+  const merged = mergeEvents(groups);
+  events.push(...merged.events);
+  conflictCount += merged.conflicts.length;
+  for (const c of merged.conflicts) {
+    console.warn(
+      `  ! conflict: "${c.kept.title}" ${c.field} differs by ${c.deltaHours}h between sources`,
+    );
+  }
+}
+
+events.sort((a, b) => a.startsAt.localeCompare(b.startsAt) || a.id.localeCompare(b.id));
+
+const feed = EventFeed.parse({
+  schemaVersion: SCHEMA_VERSION,
+  generatedAt: now,
+  events,
+  sources,
+});
+
+await Bun.write(OUT, `${JSON.stringify(feed, null, 2)}\n`);
+console.log(
+  `\n${OUT}: ${events.length} events across ${byGame.size} games, ${conflictCount} conflicts`,
+);
+
+/** "game8-events-2026-08-14.html" → ISO timestamp. */
+function fixtureDate(path: string): string | null {
+  const m = /(\d{4}-\d{2}-\d{2})\.html$/.exec(path);
+  return m?.[1] ? `${m[1]}T00:00:00.000Z` : null;
+}