feat(site): phase 17 - per-game module pages, /runicnpc/, and checkTerms over the built site

PLAN.md §16 phase 17, built on the org lead's answers of 2026-10-22,
recorded as D75-D79 (count of record 79).

- D75: core marketing pages describe what a game module adds in core's
  words. "Game intelligence" became "What a game module adds"; each
  game's own list moved to src/data/games/ and renders only on the new
  /modules/uo/ and /modules/rust/. /modules/ is a card per game.
- The page-side capability check is per game (assertGameCoverage), the
  item phase 13 moved here.
- D76: the homepage keeps its game screenshot, labelled. screens.mjs
  entries may carry `game` (D67); Screenshot.astro and the app grid
  print the game's name and mark the figure data-game.
- D77: /app/ describes the Rust screens (released the same day).
- D78: /runicnpc/, the standalone page, is in the header and footer;
  the narrow header was re-measured so five links keep two rows.
- D79: checkTerms.mjs --built reads every built page's visible text
  after the build; game routes and data-game elements allow their
  game's words. Proven against ten plants. Still the twelfth check.
- Re-read fixes: /architecture/'s "two machines is also the maximum",
  Discord "guild" on /integrations/, and collection.mjs against what
  Steam sign-in and the Rust module keep (PLAY_DATA_SAFETY.md
  regenerated; the Play answers are unchanged).

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

.gitea/workflows/pr-checks.yml

@@ -115,6 +115,17 @@ jobs:
         # fails because some other host is slow is a check people learn to ignore.
         run: npm run check:links
 
+      - name: Game vocabulary in the built pages
+        # PLAN.md §16, D79 — phase 17 widened the twelfth check to the whole site. The
+        # marketing pages are templates fed from src/data/, so the words a reader sees are
+        # mostly not in any source file: a capability label, a screenshot caption, a value
+        # from platform.json. This pass reads every built page's visible text, alt, title and
+        # aria-label, the way check:links reads its hrefs. A game's routes, and elements
+        # marked data-game (<GameExample>, a game-tagged screenshot), allow that game's words.
+        #
+        # Still the twelfth check, not a thirteenth: the same script, the same word list.
+        run: npm run check:terms:built
+
       - name: Platform facts
         # PLAN.md §12 — every version, protocol number and bundle tag is re-read from
         # its authority over the Gitea API and must agree with src/data/platform.json.