fix(game8): decide a column table's header by what it produces

Game8's banner pages lay two schedules side by side inside one <table> under a
spanning label row: "Standard Banners | Banner | Rating | Availability | Paid
Banners | ...". That row is not merely unhelpful, it is plausible — it contains
both column words, so it resolves and puts the range at index 3, which no
three-cell data row has. Every row then fails to date and the table yields
nothing at all, with no error anywhere. So readColumnTable now falls back to
row 1, and only when row 0 produced nothing, which is what keeps every page
that parses today parsing identically.

Those pages also schedule banners rather than events and head their sections
accordingly, so the vocabulary learns "List of All Banners", "All Current
Banners" and — the one that matters — "Previous Banners", whose rows are dated
identically to the live ones directly above them.

This parser serves nine sources, so the widening was measured rather than
trusted: every pinned fixture and every live snapshot was parsed before and
after, and no existing source's output changed by a single event.

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

test/adapters/game8.test.ts

@@ -5,7 +5,7 @@ import { parseOrdinalDateTimeRange } from "../../src/ingest/dates.ts";
 import { arknightsWikiParser } from "../../src/ingest/parsers/akwiki.ts";
 import { blueArchiveWikiParser } from "../../src/ingest/parsers/bawiki.ts";
 import { fandomParser, renderedHtml } from "../../src/ingest/parsers/fandom.ts";
-import { inferType } from "../../src/ingest/parsers/game8.ts";
+import { game8Parser, inferType } from "../../src/ingest/parsers/game8.ts";
 import { holodoriWikiParser } from "../../src/ingest/parsers/holodori.ts";
 import { GachaEvent, type EventType } from "../../src/shared/schema.ts";
 
@@ -1351,3 +1351,73 @@ describe("Chaos Zero Nightmare (game8)", () => {
     }
   });
 });
+
+describe("game8 column vocabulary", () => {
+  // The parser directly rather than through an adapter: `canParse` guards the
+  // seam against a redesigned *page*, and these are hand-built table snippets.
+  const parse = (html: string) =>
+    game8Parser.parse(html, {
+      now: NOW,
+      // Hand-built table snippets, so the context is a label rather than a
+      // claim about a game — these assert table shape, not any one page.
+      sourceUrl: "https://game8.co/games/Genshin-Impact/archives/301601",
+      sourceId: "genshin-game8-events",
+      game: "genshin",
+    });
+
+  test("falls back to the second row when the first is a spanning label", () => {
+    // Game8 lays two schedules side by side in one <table> and gives the pair a
+    // label row. Reading that row as the header finds the range column at an
+    // index no data row has, so every row fails to date and the table silently
+    // yields nothing.
+    const events = parse(
+      `<h2>List of All Banners</h2><table>
+         <tr><th>Standard Banners</th><th>Banner</th><th>Rating</th><th>Availability</th>
+             <th>Paid Banners</th><th>Banner</th><th>Rating</th><th>Availability</th></tr>
+         <tr><th>Banner</th><th>Rating</th><th>Availability</th></tr>
+         <tr><td>Seeking the Pearl</td><td>★★★★☆</td><td>8/12/2026 - 8/21/2026</td></tr>
+       </table>`,
+    );
+    expect(events.map((e) => e.title)).toEqual(["Seeking the Pearl"]);
+  });
+
+  test("row 0 still wins wherever it resolves both columns", () => {
+    // The fallback must never let a page that parses today start reading a
+    // different row. Here row 0 is a real header and row 1 is data.
+    const events = parse(
+      `<h2>Current Events</h2><table>
+         <tr><th>Event</th><th>Duration</th></tr>
+         <tr><td>First</td><td>8/12/2026 - 8/21/2026</td></tr>
+         <tr><td>Second</td><td>8/13/2026 - 8/22/2026</td></tr>
+       </table>`,
+    );
+    expect(events.map((e) => e.title)).toEqual(["First", "Second"]);
+  });
+
+  test("reads a banner-scheduling page's headings and columns", () => {
+    const events = parse(
+      `<h2>All Current Banners</h2><table>
+         <tr><th>Banner</th><th>Availability (UTC)</th></tr>
+         <tr><td>Live One</td><td>8/12/2026 - 8/21/2026</td></tr>
+       </table>
+       <h3>Previous Banners</h3><table>
+         <tr><th>Banner</th><th>Availability</th></tr>
+         <tr><td>Finished One</td><td>8/1/2026 - 8/9/2026</td></tr>
+       </table>`,
+    );
+    expect(events.map((e) => e.title)).toEqual(["Live One"]);
+  });
+
+  test("`Banner Guides` is navigation, not a schedule", () => {
+    // The widened title column must not turn Game8's nav tables into events.
+    // This one has no range column at all, so it yields nothing either way —
+    // the assertion is that widening `Event` to `Banner` did not change that.
+    const events = parse(
+      `<h2>Current Events</h2><table>
+         <tr><th>Banner Guides</th></tr>
+         <tr><td>List of All Banners</td><td>Upcoming Banners</td></tr>
+       </table>`,
+    );
+    expect(events).toEqual([]);
+  });
+});