Pokemon Silver as a full launcher version, plus launcher mods-list and title-tempo fixes

Silver: derived import manifest (tools/make_silver_manifest.py re-resolves
the Gold manifest's symbols from pokesilver.sym), silver GameVersion row,
generation-keyed extractor routing, required-files override, edition save
stamping (a Silver playthrough no longer writes into the Gold save),
checkver-driven edition data, SILVER/KAMON/OSCAR/MAX presets, GOLD rival
default, edition credits banner, Lugia title screen (OAM layouts, bob,
trail, palettes as title.lua data keys with Gold defaults so old caches
need no re-import), packaging for every build target, docs, and tests.

Launcher: the installed-mods list is one continuous scroll (rows culled to
the viewport) instead of a pager with an inner scroll viewport; the pad
cursor's edge-scroll no longer runs it to the bottom. The game dropdown
shows just the initial and caret. Find-tab behavior unchanged.

Title tempo: a sprite-anim frame shows duration+1 ticks
(engine/sprite_anims/core.asm GetSpriteAnimFrame), which locks both
editions' 64-tick wing beat to the 64-tick sine bob; the title screens no
longer run fast and out of phase.

src/core/Game2.lua

@@ -3,7 +3,7 @@
 -- everything under src/*/gen2 reaches shared services through here.  Gen 1
 -- Game:load cannot consume a Gen 2 cache -- different generated tables, save
 -- shape and screen registry -- so main.lua's bootGame picks this owner when
--- GameVersion.isGold(), and the two never branch into each other.
+-- GameVersion.generation() == 2, and the two never branch into each other.
 --
 -- Boot: copyright → GameFreak Presents → GS intro stub → title
 -- (tilemap + Ho-Oh flap / clouds / trails) → Oak speech (Marill + shrink)
@@ -1702,7 +1702,7 @@ function Game2:hotkey(key)
     self:writeSave()
     return true
   elseif key == "f2" then
-    local loaded = Save.load("gold")
+    local loaded = Save.load()
     if loaded then self:continueGame(loaded) end
     return true
   elseif key == "1" then

src/core/GameVersion.lua

@@ -1,5 +1,5 @@
 -- Which game this process is running: Red (the historical default), Blue,
--- Yellow, or Gold.  One source of truth for everything that differs by
+-- Yellow, Gold, or Silver.  One source of truth for everything that differs by
 -- version -- the accepted ROM hash, the import manifest, where the
 -- extracted cache lives, and the save-file suffix -- so the importer,
 -- cache mount, SaveData, title screen and palette all agree.
@@ -8,7 +8,8 @@
 -- saves are untouched, but its extracted cache lives under red/ like Blue,
 -- Yellow, and Gold (issue #899); a legacy root cache is moved into red/ once
 -- by CacheFs.migrateLegacyRedCache.  All supported versions can be imported
--- and selected side by side.  Gold is Gen 2 (see docs/gold-phase1.md).
+-- and selected side by side.  Gold and Silver are Gen 2 (see
+-- docs/gold-phase1.md).
 --
 -- Zero requires, so it loads during love.conf and under plain Lua for tools
 -- and tests.  The active version is a process-global set once at boot from
@@ -61,13 +62,26 @@ GameVersion.VERSIONS = {
     manifest = "tools/rom_manifest_gold.json",
     cachePrefix = "gold/",    -- gold/data/generated, gold/assets/generated
     saveSuffix = "_gold",     -- save_gold.lua / .bak / .tmp
-    -- The only row that carries one; absent reads as 1 (GameVersion.generation)
+    -- Absent reads as 1 (GameVersion.generation)
+    generation = 2,
+  },
+  -- Gold's engine with edition-selected data; the manifest is derived from
+  -- Gold's by tools/make_silver_manifest.py.
+  silver = {
+    id = "silver",
+    label = "Silver",
+    displayName = "Pokemon Silver",
+    launcherName = "Silver (Beta)",
+    sha1 = "49b163f7e57702bc939d642a18f591de55d92dae",
+    manifest = "tools/rom_manifest_silver.json",
+    cachePrefix = "silver/",  -- silver/data/generated, silver/assets/generated
+    saveSuffix = "_silver",   -- save_silver.lua / .bak / .tmp
     generation = 2,
   },
 }
 
 -- Launcher column order.
-GameVersion.ORDER = { "red", "blue", "yellow", "gold" }
+GameVersion.ORDER = { "red", "blue", "yellow", "gold", "silver" }
 
 GameVersion.current = "red"
 

src/core/LaunchOptions.lua

@@ -39,6 +39,7 @@ local function normalizeVersion(v)
     b = "blue", blue = "blue",
     y = "yellow", yellow = "yellow",
     g = "gold", gold = "gold",
+    s = "silver", silver = "silver",
   }
   v = alias[v] or v
   if GameVersion.VERSIONS and not GameVersion.VERSIONS[v] then return nil end

src/core/TouchControls.lua

@@ -218,7 +218,7 @@ function TouchControls.defaultLayout(ww, wh, ox, oy, scale)
   local ssW = dpadW * 0.30
   local margin = dpadW * 0.12
   local ok, GameVersion = pcall(require, "src.core.GameVersion")
-  if ok and GameVersion.isGold and GameVersion.isGold() then
+  if ok and GameVersion.generation and GameVersion.generation() == 2 then
     margin = math.max(margin, math.min(ww * 0.10, 72))
   end
   return {

src/core/gen2/Save.lua

@@ -103,7 +103,7 @@ Save.PLAYER_STATES = {
 }
 
 local function saveNames(version)
-  version = version or "gold"
+  version = version or GameVersion.get()
   -- Resolve the ACTIVE SLOT the same way SaveData does, and only fall back to
   -- the flat save_<version>.lua when no slot is registered.
   --
@@ -133,16 +133,22 @@ local function fs()
   return love.filesystem
 end
 
--- A fresh Gold save.  `opts` carries what the intro collected: player name,
+-- The blank-name fallback is the first PlayerNameArray row, which differs
+-- per edition -- data/player_names.asm:12-23.
+function Save.defaultPlayerName(version)
+  return (version or GameVersion.get()) == "silver" and "SILVER" or "GOLD"
+end
+
+-- A fresh Gen 2 save.  `opts` carries what the intro collected: player name,
 -- rival name, and the options the OPTION screen was left on.
 function Save.newGame(opts)
   opts = opts or {}
   local save = {
     format = Save.FORMAT,
-    version = "gold",
+    version = GameVersion.get(),
     generation = 2,
     player = {
-      name = opts.playerName or "GOLD",
+      name = opts.playerName or Save.defaultPlayerName(),
       -- _ResetWRAM rolls wPlayerID out of hRandomSub/hRandomAdd
       -- (engine/menus/intro_menu.asm:41-49).
       id = opts.trainerId or rand(0, 65535),
@@ -374,10 +380,13 @@ end
 function Save.normalize(save)
   if type(save) ~= "table" then return nil end
   save.format = save.format or Save.FORMAT
-  save.version = "gold"
+  if not (GameVersion.VERSIONS[save.version]
+      and GameVersion.generation(save.version) == 2) then
+    save.version = GameVersion.get()
+  end
   save.generation = 2
   save.player = save.player or {}
-  save.player.name = save.player.name or "GOLD"
+  save.player.name = save.player.name or Save.defaultPlayerName(save.version)
   save.player.id = save.player.id or rand(0, 65535)
   save.player.money = math.max(0, math.min(save.player.money or 0, Save.MAX_MONEY))
   save.player.coins = math.max(0, math.min(save.player.coins or 0, Save.MAX_COINS))
@@ -753,21 +762,24 @@ end
 -- copy is the witness that survives a crash mid-replace.
 function Save.save(save)
   if type(save) ~= "table" then return false, "no save" end
-  if (save.version or "gold") == "gold" then
+  Save.normalize(save)
+  local version = save.version
+  do
     local ok, SaveData = pcall(require, "src.core.SaveData")
-    if ok and SaveData.activeSlot and not SaveData.activeSlot("gold") then
-      local id = SaveData.createSlot and SaveData.createSlot("gold")
-      if id and SaveData.setActiveSlot then SaveData.setActiveSlot("gold", id) end
+    if ok and SaveData.activeSlot and not SaveData.activeSlot(version) then
+      local id = SaveData.createSlot and SaveData.createSlot(version)
+      if id and SaveData.setActiveSlot then
+        SaveData.setActiveSlot(version, id)
+      end
     end
   end
-  local main, backup, tmp = saveNames(save.version)
+  local main, backup, tmp = saveNames(version)
   local f = fs()
   if not f then return false, "no filesystem" end
   -- saveNames may now return a saves/<version>/<slot>.lua path, and
   -- love.filesystem.write does not create missing parent directories.
   local dir = main:match("^(.*)/[^/]+$")
   if dir and f.createDirectory then f.createDirectory(dir) end
-  Save.normalize(save)
   save.savedAt = os.time()
   local encoded = SaveSerializer.encode(save)
   if f.getInfo(main) then