docs: record what sources exist for the games we still don't cover

The loudest feedback on the first release was "not enough games", so the
same wikis get researched again every pass — and the expensive half of
that work is not finding a page, it is establishing that a page which
fetches and parses cleanly is a 2021 archive, or states a wall clock with
no timezone, or belongs to a game that is shutting down in October.

This writes down what was actually checked on 2026-08-18: what each page
publishes, which existing parser can already read it, whether CI could
ever fetch it, and the hazard that would produce a confidently wrong date.
The verdicts stay proposals — once one is acted on the ruling belongs in
AGENTS.md § Scraping conduct, next to the sources already declined.

Indexed in the doc table so it is found before the search starts, not
after.

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

AGENTS.md

@@ -20,6 +20,7 @@ between repairing a rule and rediscovering it the expensive way.
 | `docs/INGESTION.md` | The six pipeline stages, the parser/adapter/merge layering, date formats, the review gate | Adding a source, writing or repairing a parser, or changing the fetch runner |
 | `docs/ARCHITECTURE.md` | Process shape, file layout, request paths, offline and update mechanics | Moving files, adding a route, or changing the service worker |
 | `docs/FEEDBACK.md` | What readers actually said about the first release, and the work it argues for | Deciding what to build next |
+| `docs/SOURCES.md` | Which sites publish a usable schedule for the games we still do not cover, and what is wrong with the ones that do not | Picking the next game to add, or assessing a source request |
 
 Two rules that follow from that: