feat(docs): phase 14 - game-neutral core docs, an Ultima Online group, and checkTerms

PLAN.md §16, D63/D64, plus D67-D69 taken 2026-10-22.

- Core docs use core's words: a Team, a game server, the sidecar, the bridge
  plugin, the game module. Detail that belonged to Ultima Online moved into
  its pages rather than being dropped.
- New "Ultima Online" sidebar group (nine pages): an overview, Connect a
  ServUO shard, Verify the bridge, The shard connection, Client files,
  Troubleshooting, Bridge.cfg, sidecar.toml, Shard event catalog. Five moved
  URLs answer a real 301 (src/config/redirects.mjs, asserted by the served
  test).
- Getting started is game-neutral. "Connect your game server" keeps the old
  URL and hands off to each game; Rust links docs main:rust-link/INSTALL.md
  until phase 15. "Verify the whole stack" stays, neutral (D69).
- D68: GameExample.astro labels a game's real example on a core page with the
  game's name; checkTerms allows that game's words inside it.
- scripts/checkTerms.mjs, the twelfth check: 16 game words, docs pages and
  both sidebar trees, one allowlisted phrase (Discord's "Guild (server) ID").
  Wired into verify and pr-checks.yml.
- canonicalDocs grouped by game; the Rust group carries four documents.
- D67: the screenshot rule from #32 is adopted.

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

package.json

@@ -22,6 +22,7 @@
     "check:quickstart": "node scripts/checkQuickstart.mjs",
     "check:reference": "node scripts/checkReference.mjs",
     "check:sidebar": "node scripts/checkSidebar.mjs",
+    "check:terms": "node scripts/checkTerms.mjs",
     "check:screens": "node scripts/checkScreens.mjs",
     "check:a11y": "node scripts/checkA11y.mjs",
     "check:csp": "node scripts/checkCsp.mjs",
@@ -31,7 +32,7 @@
     "brand:assets": "node scripts/buildBrandAssets.mjs",
     "screens:capture": "node scripts/captureScreens.mjs",
     "csp:hashes": "node scripts/checkCsp.mjs --reset && astro build && node scripts/checkCsp.mjs --write && astro build && node scripts/checkCsp.mjs",
-    "verify": "npm run check:sidebar && npm run check:screens && npm run check:tokens && npm run check:brand && npm run check:datasafety && npm run check && npm test && npm run build && npm run check:links && npm run check:facts && npm run check:quickstart && npm run check:reference && npm run test:served && npm run check:a11y && npm run check:csp",
+    "verify": "npm run check:sidebar && npm run check:terms && npm run check:screens && npm run check:tokens && npm run check:brand && npm run check:datasafety && npm run check && npm test && npm run build && npm run check:links && npm run check:facts && npm run check:quickstart && npm run check:reference && npm run test:served && npm run check:a11y && npm run check:csp",
     "test:served": "node --test test/headers.test.mjs"
   },
   "dependencies": {