feat: add emulator/system pack generation, validation checks, path resolution

add --emulator, --system, --standalone, --list-emulators, --list-systems
to verify.py and generate_pack.py. packs are RTU with data directories,
regional BIOS variants, and archive support.

validation: field per file (size, crc32, md5, sha1) with conflict
detection. by_path_suffix index in database.json for regional variant
resolution via dest_hint. restructure GameCube IPL to regional subdirs.

66 E2E tests, full pipeline verified.

emulators/jollycv.yml

@@ -1,7 +1,9 @@
 emulator: JollyCV
 type: libretro
+core_classification: official_port
 source: "https://github.com/libretro/jollycv"
-profiled_date: "2026-03-18"
+upstream: "https://gitlab.com/jgemu/jollycv"
+profiled_date: "2026-03-21"
 core_version: "2.0.0"
 display_name: "ColecoVision/CreatiVision/My Vision (JollyCV)"
 cores:
@@ -47,11 +49,9 @@ files:
   # --- ColecoVision BIOS (required for CV games) ---
   - name: "coleco.rom"
     system: colecovision
-    description: "ColecoVision BIOS ROM"
     required: true
     size: 8192
-    md5: "2c66f5911e5b42b8ebe113403548eee7"
-    sha1: "4aa1d9b48f39b68bb17b3d6997b74850c6089dc3"
+    validation: [size]
     source_ref: "libretro/libretro.c:701, src/jcv_coleco.c:402-406"
     notes: "Mapped at 0x0000-0x1FFF. Replaced by SGM lower RAM when Super Game Module is active. Must be exactly 8192 bytes."
 
@@ -61,6 +61,7 @@ files:
     description: "VTech CreatiVision BIOS ROM"
     required: true
     size: 2048
+    validation: [size]
     source_ref: "libretro/libretro.c:711, src/jcv_crvision.c:315-318"
     notes: "Mapped at 0xF800-0xFFFF. Must be exactly 2048 bytes."