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.

scripts/switch/pack_sd_zip.sh

@@ -71,15 +71,15 @@ First install or update (same steps):
      your saves, imported ROMs, mods, and options. Re-extracting only
      replaces the NRO(s) and these help files.
   3. Launch with title override (hold R on HOME, open any title → hbmenu).
-  4. Copy a legal Pokemon Red/Blue .gb or Yellow/Gold/Silver .gbc into:
+  4. Copy a legal Pokemon Red/Blue .gb or Yellow/Gold/Silver/Crystal .gbc into:
        switch/gen1recomp/pokemon-love2d/imports/
      then use Scan again in the launcher if needed.
 
 Inboxes (drop files here via MTP / SD / FTP):
   imports/                      — ROM .gb / .gbc
   imports/mods/                 — community mod .zip
-  imports/saves/red|blue|yellow|gold|silver/  — raw .sav import (Gold/Silver cart .sav not yet)
-  exports/red|blue|yellow|gold|silver/        — pull after Export save (Gold/Silver not yet)
+  imports/saves/red|blue|yellow|gold|silver|crystal/  - raw .sav import (Gen 2 cart .sav not yet)
+  exports/red|blue|yellow|gold|silver|crystal/        - pull after Export save (Gen 2 not yet)
 
 Full guide: https://github.com/bryanthaboi/gen1recomp/blob/main/docs/switch-install.md
 EOF
@@ -92,7 +92,7 @@ write_readme() {
 }
 
 write_readme "$SAVE_ROOT/imports/README.txt" \
-  "Put a legal Pokemon Red/Blue .gb or Yellow/Gold/Silver .gbc here, then Scan again in the launcher."
+  "Put a legal Pokemon Red/Blue .gb or Yellow/Gold/Silver/Crystal .gbc here, then Scan again in the launcher."
 write_readme "$SAVE_ROOT/imports/mods/README.txt" \
   "Put community mod .zip files here, then MODS → Scan again."
 write_readme "$SAVE_ROOT/imports/saves/red/README.txt" \
@@ -105,6 +105,8 @@ write_readme "$SAVE_ROOT/imports/saves/gold/README.txt" \
   "Gold cart .sav import is not supported yet. Folder reserved so MTP matches the other games."
 write_readme "$SAVE_ROOT/imports/saves/silver/README.txt" \
   "Silver cart .sav import is not supported yet. Folder reserved so MTP matches the other games."
+write_readme "$SAVE_ROOT/imports/saves/crystal/README.txt" \
+  "Crystal cart .sav import is not supported yet. Folder reserved so MTP matches the other games."
 write_readme "$SAVE_ROOT/exports/red/README.txt" \
   "After Export save (Red), copy the .sav out of this folder via MTP / SD / FTP."
 write_readme "$SAVE_ROOT/exports/blue/README.txt" \
@@ -115,6 +117,8 @@ write_readme "$SAVE_ROOT/exports/gold/README.txt" \
   "Gold cart .sav export is not supported yet. Folder reserved so MTP matches the other games."
 write_readme "$SAVE_ROOT/exports/silver/README.txt" \
   "Silver cart .sav export is not supported yet. Folder reserved so MTP matches the other games."
+write_readme "$SAVE_ROOT/exports/crystal/README.txt" \
+  "Crystal cart .sav export is not supported yet. Folder reserved so MTP matches the other games."
 
 rm -f "$OUT_ZIP"
 (
@@ -145,11 +149,13 @@ REQUIRED=(
   "switch/gen1recomp/pokemon-love2d/imports/saves/yellow/README.txt"
   "switch/gen1recomp/pokemon-love2d/imports/saves/gold/README.txt"
   "switch/gen1recomp/pokemon-love2d/imports/saves/silver/README.txt"
+  "switch/gen1recomp/pokemon-love2d/imports/saves/crystal/README.txt"
   "switch/gen1recomp/pokemon-love2d/exports/red/README.txt"
   "switch/gen1recomp/pokemon-love2d/exports/blue/README.txt"
   "switch/gen1recomp/pokemon-love2d/exports/yellow/README.txt"
   "switch/gen1recomp/pokemon-love2d/exports/gold/README.txt"
   "switch/gen1recomp/pokemon-love2d/exports/silver/README.txt"
+  "switch/gen1recomp/pokemon-love2d/exports/crystal/README.txt"
 )
 for rel in "${REQUIRED[@]}"; do
   printf '%s\n' "$LISTING" | grep -Fq "$rel" || fail "zip missing $rel"

scripts/switch/selftest_build_switch.sh

@@ -272,11 +272,13 @@ for rel in \
   "switch/gen1recomp/pokemon-love2d/imports/saves/yellow/README.txt" \
   "switch/gen1recomp/pokemon-love2d/imports/saves/gold/README.txt" \
   "switch/gen1recomp/pokemon-love2d/imports/saves/silver/README.txt" \
+  "switch/gen1recomp/pokemon-love2d/imports/saves/crystal/README.txt" \
   "switch/gen1recomp/pokemon-love2d/exports/red/README.txt" \
   "switch/gen1recomp/pokemon-love2d/exports/blue/README.txt" \
   "switch/gen1recomp/pokemon-love2d/exports/yellow/README.txt" \
   "switch/gen1recomp/pokemon-love2d/exports/gold/README.txt" \
-  "switch/gen1recomp/pokemon-love2d/exports/silver/README.txt"
+  "switch/gen1recomp/pokemon-love2d/exports/silver/README.txt" \
+  "switch/gen1recomp/pokemon-love2d/exports/crystal/README.txt"
 do
   printf '%s\n' "$ZIP_LIST" | grep -Fq "$rel" || PACK_MISSING="${PACK_MISSING} ${rel}"
 done