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

src/styles/global.css

@@ -226,6 +226,7 @@ svg {
     flex-wrap: wrap;
     justify-content: flex-start;
     row-gap: 0.15rem;
+    column-gap: 0.5rem;
     padding-block: 0.55rem;
     min-height: 0;
   }
@@ -236,12 +237,16 @@ svg {
     gap: 0;
     /* Pull the first link's own padding back to the gutter so the row of links
        lines up with the lockup above it rather than sitting indented. */
-    margin-left: -0.45rem;
+    margin-left: -0.3rem;
   }
 
+  /* Five links since phase 17 (D78, RunicNPC). Measured at 390px, the fifth pushed Search
+     onto a third row: the links ended at 326px, and the row's 24px gap plus the 32px
+     button needed 382 of the 366 available. A tighter gap, padding and type put all of it
+     back on the second row with room to spare, and every link still clears a 24px target. */
   .site-nav a {
-    padding-inline: 0.45rem;
-    font-size: 0.86rem;
+    padding-inline: 0.3rem;
+    font-size: 0.84rem;
   }
 
   /* Search (D47) shares the second row with the links rather than taking a third. `order`