feat: complete all emulator profiles, 95 engines total

Final batch: scummvm (55 files, MT-32/engine data/themes/shaders),
gearcoleco (colecovision.rom), geargrafx (4 syscard variants),
gearlynx (lynxboot.img), dosbox_core (MT-32 + BASS libs),
geolith (Neo Geo FPGA, aes.zip/neogeo.zip), retrodream (DC boot+flash),
noods (NDS, full HLE), freej2me (JAR), jollycv (coleco+creativision),
fixgb (gbc_bios), numero (TI-83), smsplus (SMS/GG/CV), vircon32

95 profiles covering every libretro core with firmware requirements.
Cross-reference: 803 undeclared files, 249 in repo, 554 to source.

emulators/gearcoleco.yml

@@ -0,0 +1,56 @@
+emulator: Gearcoleco
+type: libretro
+source: "https://github.com/drhelius/Gearcoleco"
+cores:
+  - gearcoleco
+systems:
+  - colecovision
+
+notes: |
+  Gearcoleco is a ColecoVision emulator by Ignacio Sanchez (drhelius).
+  The ColecoVision BIOS ROM is required to run games. Without it, the
+  core displays a static "no BIOS" placeholder image (kNoBiosImage from
+  no_bios.h) and games will not execute.
+
+  The BIOS is loaded in load_bootroms() (libretro.cpp:293-305) from the
+  system directory. The core first tries "colecovision.rom", then falls
+  back to "coleco.rom" if the first file is not found.
+
+  Memory.cpp:LoadBios() validates the file size must be exactly 8192
+  bytes (0x2000). No hash check is performed by the core itself.
+
+  On reset, the BIOS byte at offset 0x69 is patched to select region:
+  0x3C for NTSC, 0x32 for PAL (Memory.cpp:184-187).
+
+  The core also supports Super Game Module (SGM) expanded RAM but that
+  requires no additional BIOS files.
+
+files:
+  # --- ColecoVision BIOS (required) ---
+  - name: "colecovision.rom"
+    system: colecovision
+    description: "ColecoVision BIOS ROM"
+    required: true
+    size: 8192
+    source_ref: "platforms/libretro/libretro.cpp:297 (load_bootroms)"
+    notes: "Primary filename. Loaded via Memory::LoadBios(), must be exactly 8192 bytes."
+
+  - name: "coleco.rom"
+    system: colecovision
+    description: "ColecoVision BIOS ROM (legacy filename)"
+    required: false
+    size: 8192
+    source_ref: "platforms/libretro/libretro.cpp:303 (load_bootroms fallback)"
+    notes: "Fallback filename tried when colecovision.rom is not found."
+
+platform_details:
+  colecovision:
+    bios_filename: "colecovision.rom"
+    bios_fallback: "coleco.rom"
+    bios_size: 8192
+    source_ref: "src/Memory.cpp:228-258"
+    notes: |
+      LoadBios() reads the file as raw binary. Size must be exactly 0x2000
+      (8192 bytes) or the load is rejected with a log message. The BIOS is
+      mapped at address 0x0000-0x1FFF in the ColecoVision memory map. On
+      reset, byte 0x69 is patched for NTSC/PAL region selection.