widen event duration ceiling to 365 days

Patch cycles are ~6 weeks, so a span over 180 days previously indicated
a misread year. However, real year-long events exist in this domain:
Genshin's anniversary 5-star selection runs 336 days (2025-10-22 to
2026-09-23), correctly dated on its wiki, and Fire Emblem Heroes runs a
seven-month new-player banner (docs/SOURCES.md § 12b).

Widening the ceiling to 365 days admits genuinely year-long events while
still catching misread years, which place the end 12 months out (span +
~365, or 405+ days for a 6-week event).

Update test/adapters/game8.test.ts duration test, AGENTS.md domain rules,
and docs/INGESTION.md sanity checks.

docs/INGESTION.md

@@ -516,7 +516,7 @@ quarantine with `reason: 'sanity_failed'` — never to the feed.
 | Rule | Rationale |
 |---|---|
 | `endsAt` after `startsAt` when both present | A backwards interval is always a parse error |
-| Duration under 180 days | Patch cycles are ~6 weeks; longer means a misread year |
+| Duration under 365 days | Patch cycles are ~6 weeks; a year-plus span means a misread year. Raised from 180 on 2026-09-12, when a real 336-day event arrived — see AGENTS.md § Domain rules. Until this stage is built, the rule lives only in `test/adapters/game8.test.ts` |
 | `startsAt` within [now − 2y, now + 1y] | Catches century typos and relative-date misreads |
 | `endsAt` null exactly when `endPrecision` is `"unknown"` | The two fields must agree |
 | `regionEnds` non-null exactly when `regionScoped` | Same |