feat: re-profile 30 emulators, beetle to parallel_n64

source-verified: mesen FdsBios.bin→alias, MesenDB.txt phantom (embedded).
mupen64plus 64DD_IPL.bin→IPL.n64 (code path fix). neocd 000-lo.lo/ng-lo.rom
phantoms (algorithmically generated). new profiles: mesen-s, mupen64plus
next develop/gles2/gles3. regenerate database.

emulators/mednafen_supergrafx.yml

@@ -1,8 +1,53 @@
-emulator: "mednafen_supergrafx"
-type: alias
-alias_of: "mednafen_pce"
+emulator: mednafen_supergrafx
+type: libretro
+core_classification: community_fork
+source: "https://github.com/libretro/beetle-supergrafx-libretro"
+upstream: "https://mednafen.github.io/"
 profiled_date: "2026-03-24"
 core_version: "v1.23.0"
 display_name: "NEC - PC Engine SuperGrafx (Beetle SuperGrafx)"
-note: "Different repo (beetle-supergrafx-libretro) but loads identical BIOS files as mednafen_pce."
-files: []
+cores: [mednafen_supergrafx]
+systems: [nec-pc-engine]
+verification: existence
+notes: >
+  Fork of Mednafen's pce_fast module with SuperGrafx and CD support.
+  Separate codebase from beetle_pce (mednafen/pce_fast/ vs mednafen/pce/).
+  BIOS loaded via HuC_LoadCD() at CD-ROM load time. Core option "sgx_cdbios"
+  selects which card image to use (default: System Card 3).
+  DetectGECD() auto-detects Games Express discs and overrides to gexpress.pce.
+  DetectSGXCD() detects SuperGrafx CD titles via magic bytes.
+  Arcade Card mode (sgx_arcadecard option, not exposed) extends System Card 3
+  with extra RAM mapping.
+  No hash or size validation on BIOS load.
+  Upstream pce_fast module has a single pce_fast.cdbios string setting;
+  the 4-option dropdown is a libretro addition. Upstream has no separate
+  gecdbios setting (unlike the accurate pce module).
+
+files:
+  - name: "syscard3.pce"
+    description: "CD-ROM System Card 3.0 (Japan)"
+    region: "NTSC-J"
+    required: true
+    source_ref: "libretro.cpp:972-973, mednafen/settings.cpp:37"
+    notes: "Default value for sgx_cdbios option."
+
+  - name: "syscard2.pce"
+    description: "CD-ROM System Card 2.0 (Japan)"
+    region: "NTSC-J"
+    required: false
+    source_ref: "libretro.cpp:974-975"
+    notes: "sgx_cdbios = 'System Card 2'."
+
+  - name: "syscard1.pce"
+    description: "CD-ROM System Card 1.0 (Japan)"
+    region: "NTSC-J"
+    required: false
+    source_ref: "libretro.cpp:976-977"
+    notes: "sgx_cdbios = 'System Card 1'."
+
+  - name: "gexpress.pce"
+    description: "Games Express CD Card"
+    region: "NTSC-J"
+    required: false
+    source_ref: "libretro.cpp:978-979, mednafen/pce_fast/pce.cpp:330-367,453-454"
+    notes: "sgx_cdbios = 'Games Express' or auto-detected via DetectGECD()."