feat: hle_fallback on 39 emulator profiles (266 entries)

Batch analysis of all 273 profiles to identify HLE/embedded
fallbacks. Added hle_fallback: true where the core has verified
software replacement for missing BIOS files:

- Embedded ROMs: vice (102), ep128emu (22), fuse (18), frodo (4)
- HLE BIOS: bsnes* (33 across 3 profiles), puae (9 AROS),
  noods (4), melonds* (6 FreeBIOS), flycast (3 reios)
- Open-source replacements: sameboy (8), pokemini (1), gpsp (1)
- Built-in fallbacks: np2kai (7), atari800 (6 Altirra),
  picodrive (3), quasi88 (4), gambatte (2)

Conservative: only added where notes or source code confirm HLE.
Skipped 50+ profiles where files are optional alternatives, not
HLE replaceable (neocd, opera, kronos, pcem, etc.)

emulators/sameboy.yml

@@ -54,6 +54,7 @@ files:
     system: nintendo-gb
     description: "Original Game Boy (DMG) boot ROM"
     required: false
+    hle_fallback: true
     size: 256
     source_ref: "libretro.c:519,530,556 (boot_rom_load)"
     notes: "Also used as fallback for DMG_0 and MGB models when dedicated boot ROMs are absent."
@@ -63,6 +64,7 @@ files:
     system: nintendo-gb
     description: "Game Boy Pocket (MGB) boot ROM"
     required: false
+    hle_fallback: true
     size: 256
     source_ref: "libretro.c:520,531,556"
     notes: "Built-in fallback reuses dmg_boot (mgb not separately implemented yet)."
@@ -72,6 +74,7 @@ files:
     system: nintendo-sgb
     description: "Super Game Boy (SGB) boot ROM"
     required: false
+    hle_fallback: true
     size: 256
     source_ref: "libretro.c:521,532,556"
     notes: "Used for SGB and SGB_NTSC models. Also loaded temporarily when borrowing SGB border for non-SGB games."
@@ -81,6 +84,7 @@ files:
     system: nintendo-sgb
     description: "Super Game Boy 2 (SGB2) boot ROM"
     required: false
+    hle_fallback: true
     size: 256
     source_ref: "libretro.c:522,533,556"
     notes: "Separate from sgb_boot.bin, unlike some other cores that merge SGB/SGB2."
@@ -90,6 +94,7 @@ files:
     system: nintendo-gbc
     description: "Game Boy Color (CGB) boot ROM"
     required: false
+    hle_fallback: true
     size: 2304
     source_ref: "libretro.c:524,535,556"
     notes: "Also used as fallback for CGB_0 model (not separately implemented yet)."
@@ -99,6 +104,7 @@ files:
     system: nintendo-gbc
     description: "Game Boy Color early revision (CGB-0) boot ROM"
     required: false
+    hle_fallback: true
     size: 2304
     source_ref: "libretro.c:523,534,556"
     notes: "Built-in fallback reuses cgb_boot (cgb0 not separately implemented yet)."
@@ -108,6 +114,7 @@ files:
     system: nintendo-gbc
     description: "Game Boy Advance in GBC mode (AGB) boot ROM"
     required: false
+    hle_fallback: true
     size: 2304
     source_ref: "libretro.c:525,536,556"
     notes: "Used when emulating a GBA running GB/GBC software. Enables GBA-enhanced palettes in compatible GBC games."
@@ -117,6 +124,7 @@ files:
     system: nintendo-gb
     description: "Original Game Boy early revision (DMG-0) boot ROM"
     required: false
+    hle_fallback: true
     size: 256
     source_ref: "SDL/main.c:640 (standalone), libretro.c:518,529"
     notes: "Only referenced in standalone SDL build filename list. Built-in fallback reuses dmg_boot."