Add Pokemon Crystal as a sixth supported version

Crystal boots from a user-supplied ROM, imports a full cache and is playable:
copyright, the Crystal intro movie, the animated title, gender select, Oak,
and out into Johto. 122 of the cart's 169 script specials are implemented.

Import and data
- tools/make_crystal_manifest.py derives the manifest by importing
  make_gold_manifest as a library, with three additive keyword seams. Gold and
  Silver still regenerate byte-identical, which is the standing requirement for
  touching that generator.
- crystal_symbol_deltas.py and crystal_movie_symbols.py carry the symbol delta:
  Crystal renames the credits mons, splits the trainer card, Pokegear and
  pack-pal blocks by gender, and replaces the intro and title outright.
- Crystal-only manifest keys: engineFlagOrder (162 flags to Gold's 93, so the
  badge block sits one higher) and unownCharmap (the main charmap parser stops
  at the first newcharmap so the two cannot contaminate each other).

Extractor
- RomExtractorGen2 becomes three-edition. Crystal corrections: PAL_MAP_BANK
  0x13, a flat PICS_FIX pic bank, audio bank 0x5e, the mapSongs id-100 hole,
  seven NPC trades, a TradeTexts stride of 8, the five Crystal tileset anim
  steps with per-row degrade, and the column-major trainer card portraits.
- New: animated front sprites (frames, bitmasks, play and idle scripts), the
  Battle Tower roster, Kris assets, Mobile System GB art, and the Crystal
  intro and title via src/import/CrystalMovie.lua.

Engine
- GameVersion gains engine(id) and fixes(id). Gold and Silver keep their
  original bugs where the bug is not hardware dependent; Crystal gets the fixes
  Crystal shipped: Lucky Number boxes 10-14, surfing onto an NPC, and the
  Reflect and Light Screen defence overflow.
- Crystal story: Suicune and Eusine, Celebi behind the GS Ball flag, the Ruins
  of Alph chambers, Buena, the Move Tutor, the Poke Seer, and the Battle Tower
  including the wInBattleTowerBattle badge-boost guard.
- Kris and the gender flag, animated fronts in battle and the summary screen,
  and mon caught data.

Verification
- Every extracted asset is pixel-compared against pret's own source PNGs.
- Gold caches are byte-identical before and after, file for file.
- New Crystal suites plus a T2 Gen 2 tier; the full suite passes.

tests/run_tests.lua

@@ -1338,7 +1338,7 @@ do
   Game.save.pokedex.owned.EKANS = nil
   local cb = BattleState.newWild(Game, "EKANS", 5)
   cb:storeCaughtMon()
-  check(hasText(cb, "New POKéDEX data\nwill be added for\nEKANS!"),
+  check(hasText(cb, "New POKéDEX data\nwill be added for\vEKANS!"),
         "_ItemUseBallText06 on a first catch")
   check(Game.save.pokedex.owned.EKANS == true, "species registered as owned")
   eq(cb.result, "caught", "catch resolves the battle")
@@ -1348,7 +1348,7 @@ do
   for _ = 1, 6 do table.insert(Game.save.party, Pokemon.new(Data, "RATTATA", 5)) end
   local cb2 = BattleState.newWild(Game, "EKANS", 5)
   cb2:storeCaughtMon()
-  check(hasText(cb2, "EKANS was\ntransferred to\nsomeone's PC!"),
+  check(hasText(cb2, "EKANS was\ntransferred to\vsomeone's PC!"),
         "_ItemUseBallText08 before meeting Bill")
   check(not hasText(cb2, "New POKéDEX data"),
         "no dex page for an already-owned species")
@@ -1372,7 +1372,7 @@ do
   Game.save.flags.EVENT_MET_BILL = true
   local cb3 = BattleState.newWild(Game, "EKANS", 5)
   cb3:storeCaughtMon()
-  check(hasText(cb3, "EKANS was\ntransferred to\nBILL's PC!"),
+  check(hasText(cb3, "EKANS was\ntransferred to\vBILL's PC!"),
         "_ItemUseBallText07 after meeting Bill")
   Game.save.flags.EVENT_MET_BILL = nil
 
@@ -3485,10 +3485,14 @@ runSuites({ "tests/rom_importer_cursor_test.lua" })
 -- ---------------------------------------------- launcher last played tab (#835)
 runSuites({ "tests/rom_importer_last_version_test.lua" })
 
--- ---------------------------------------------- Gold (Gen 2)
--- All ROM-free: each file carries its own fixtures shaped like the extractor's
--- output, so they run without a Gold cache.
-runSuites({
+-- ---------------------------------------------- Gold / Crystal (Gen 2)
+-- All ROM-free: own fixtures, or a self-skip on a missing cache.  Globbed on
+-- the historical chain; tests/run_gen2.lua runs the same set, one per process.
+local LEAKS_SAVE_SLOT_STATE = {
+  ["tests/gen2_save_export_test.lua"] = true,
+}
+runSuites(orderedGlob(
+  "tests/gen2_*.lua tests/crystal_*.lua tests/rom_lz3_test.lua", {
   "tests/rom_lz3_test.lua",
   "tests/gen2_world_test.lua",
   "tests/gen2_audio_test.lua",
@@ -3599,10 +3603,8 @@ runSuites({
   -- name resolution, and the .sav converter refusing a Gen 2 save table.
   "tests/gen2_sound_alias_test.lua",
   "tests/gen2_save_convert_cli_test.lua",
-  -- The wall radios (`special MapRadio`); the Pokegear-proper suites next to
-  -- it (gen2_pokegear_unlock_test, gen2_save_export_test) stay out of this
-  -- block because their headers ask for a GOLD_CACHE, which this tier cannot
-  -- assume.
+  -- The wall radios (`special MapRadio`).  gen2_save_export_test cannot share a
+  -- process (LEAKS_SAVE_SLOT_STATE above); tests/run_gen2.lua runs it alone.
   "tests/gen2_map_radio_test.lua",
   -- The two seams where a battle meets everything else: what ends a round and
   -- a battle (and what a battle may not leave on the party), and BattlePack --
@@ -3613,7 +3615,13 @@ runSuites({
   -- which failures suppress the attack animation, and the Rollout /
   -- EFFECT_RAMPAGE lock-ins.  ROM-free like the rest of this block.
   "tests/gen2_battle_lockin_test.lua",
-})
+  -- Crystal rides the same glob: crystal_*.lua and the gen2_crystal_* files.
+  "tests/crystal_import_test.lua",
+  "tests/crystal_world_test.lua",
+  "tests/gen2_crystal_anim_test.lua",
+  "tests/gen2_crystal_caught_data_test.lua",
+  "tests/gen2_crystal_gender_test.lua",
+}, LEAKS_SAVE_SLOT_STATE))
 
 -- ---------------------------------------------- Android second ROM pick (#167)
 runSuites({ "tests/rom_importer_android_pick_test.lua" })