Restore the Pro Libertate Games title and splash; list Katan under Board Games

The bootstrap rebranded the app to Pilgrims of Katan (WALA-118 review);
the decision is to keep the upstream's own identity instead.

- Title and splash: the upstream originals restored exactly — the Wallace
  tartan splash under the "Pro Libertate Games" uncial wordmark
  (SplashScreen.kt, Tartan.kt), the tartan launcher icon, and the
  Theme.ProLibertateGames window theme. The game screens go back to the
  upstream WallaceGold/WallaceRed accents the tartan is woven from.
- Names and colours: launcher names back to "Pro Libertate Games" /
  "Pro Libertate Games DEV"; the channel colours back to the clan red /
  hunting green setts (resValue tartan_field and friends). The installed
  identity stays ca.wallacenet.pilgrimsofkatan (+ .dev) — that is the
  package, not the brand.
- Catalogue: Katan is listed under Board Games (3-4 players, original
  blurb, no third-party marks) with available = false, so dev builds show
  it as "Coming soon" and a production build hides it until its engine
  and screen land.
- Docs: README/CLAUDE.md/docs/CI.md updated to the restored identity;
  CatalogTest's invariant now names Katan as the one deliberate exception
  rather than asserting nothing is unfinished.

Structural bootstrap untouched: applicationId, OTA repointed at the Gitea
releases, CI workflows, version stamping.

Verified: ./gradlew assembleDebug and testDebugUnitTest green — 628 tests,
0 failures.

Co-Authored-By: Paperclip <[email protected]>

app/src/test/java/org/prolibertate/games/game/CatalogTest.kt

@@ -106,17 +106,19 @@ class CatalogTest {
     }
 
     @Test
-    fun `every game in the catalogue can be played`() {
-        // There is nothing left marked "coming soon". The machinery that hides
-        // unfinished games from a production build is still there and still
-        // tested above — it simply has nothing to hide at the moment, and this
-        // is what will fail the day something is added to the list before its
-        // engine is written.
-        assertTrue(GameCatalog.all.all { it.available })
+    fun `every reference game in the catalogue can be played`() {
+        // Every game the app ships is playable. The one exception is Katan,
+        // listed so the slot exists and marked *Coming soon* until its engine
+        // and screen land — `available = false` is what keeps an unfinished
+        // game out of a production build while leaving it visible on a dev one.
         assertEquals(
-            GameCatalog.inMenu(GameMenu.BOARD, includeComingSoon = false),
-            GameCatalog.inMenu(GameMenu.BOARD, includeComingSoon = true),
+            listOf(GameCatalog.CATAN),
+            GameCatalog.all.filterNot { it.available }.map { it.id },
         )
+        // It is also the only difference the two channels see in a menu.
+        val hiddenFromProduction = GameCatalog.inMenu(GameMenu.BOARD, includeComingSoon = true) -
+            GameCatalog.inMenu(GameMenu.BOARD, includeComingSoon = false)
+        assertEquals(listOf(GameCatalog.byId(GameCatalog.CATAN)!!), hiddenFromProduction)
     }
 
     @Test