fix(ingest): keep an unannounced end out of the event blurb

The open-end vocabulary is written down twice and the two copies have to agree.
`parseOpenRange` decides whether a row is datable; `RANGE_PREFIX` strips the
range off the front of the cell so `proseAfterDates` can recover the blurb
behind it. A word the first knows and the second does not still yields the
event — with the leftover end tacked onto the summary a reader actually sees.

That is what happened to all eight Endfield rows the previous commit recovered:
`- TBA Sign-in to get extra pulls for Typhoeus!`. Adding `tba` beside `tbd`
fixes it, and a comment now says why the lists travel together, since the next
one of these will be found the same way — by reading generated fixture output.

Pins the 1.5 page beside the 1.4 one rather than replacing it. Fixtures are
permanent and these are different table shapes, not different data: 1.4 is a
single dated row, 1.5 is nine rows of open ends. The group name gains the
fixture path now that one adapter has two.

Nine rows, eight events. `Ridgeline Flows of Autumn Sign-In` reads
`Period: TBA` with no start at all, so it stays undatable and dropped.

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

src/ingest/parsers/game8.ts

@@ -362,15 +362,19 @@ const DATED_YEAR = String.raw`(?:\d{1,2}/\d{1,2}/\d{2,4}|[A-Za-z]+\.?\s+\d{1,2},
 
 /**
  * A leading range, whose end may be a date or a stated non-date such as
- * "Permanent" or "End of 4.6". Those words are listed rather than matched
- * loosely, so a real description is never mistaken for a range end.
+ * "Permanent", "TBA" or "End of 4.6". Those words are listed rather than
+ * matched loosely, so a real description is never mistaken for a range end.
+ *
+ * The list must track `parseOpenRange`'s: a shape that reader dates but this
+ * one does not strip still yields the event, with the leftover end tacked onto
+ * the front of its summary — "- TBA Sign-in to get extra pulls for Typhoeus!".
  */
 const RANGE_PREFIX = new RegExp(
   String.raw`^\s*` +
     ONE_DATE +
     String.raw`(?:\s*[-\u2013\u2014]\s*(?:` +
     ONE_DATE +
-    String.raw`|permanent|tbd|ongoing|end of [\d.]+)|\s+` +
+    String.raw`|permanent|tba|tbd|ongoing|end of [\d.]+)|\s+` +
     DATED_YEAR +
     String.raw`)?\s*`,
   "i",