feat: re-profile 40 emulators, harden CI workflows

profile emulators pd777 through tic80, add frozen snapshots
(puae2021, snes9x2002/2005/2010, stella2014/2023).

CI: replace github-script with gh CLI, add test execution,
job-level permissions, propagate changed output, pin jsonschema.

emulators/skyemu.yml

@@ -1,8 +1,70 @@
-emulator: "skyemu"
-type: alias
-alias_of: "mgba"
-profiled_date: "2026-03-18"
-core_version: "Git"
+emulator: skyemu
+type: standalone + libretro
+core_classification: official_port
+source: https://github.com/skylersaleh/SkyEmu/blob/v5/src/libretro.c
+upstream: https://github.com/skylersaleh/SkyEmu
+profiled_date: "2026-03-25"
+core_version: "v5"
 display_name: "Nintendo - Game Boy/GBA/NDS (SkyEmu)"
-note: "This core uses the same BIOS/firmware as mgba. See emulators/mgba.yml for details."
-files: []
+
+cores:
+  - skyemu
+
+systems:
+  - nintendo-gb
+  - nintendo-gbc
+  - nintendo-gba
+  - nintendo-ds
+
+notes: |
+  Multi-system emulator by skylersaleh. Libretro core built from the upstream repo.
+  All BIOS optional; bundles Cult-of-GBA BIOS (GBA), DraStic free BIOS (NDS ARM7/ARM9),
+  stub firmware (NDS), and HLE boot skip (GB/GBC). BIOS loading controlled by core options
+  (default: on). Files loaded from system_dir/SkyEmu/ subdirectory.
+  Standalone validates exact BIOS file size; libretro only rejects files exceeding buffer.
+  .info missing gb_bios.bin (gb.h:1603).
+
+files:
+  - name: cgb_boot.bin
+    description: GBC boot ROM
+    path: SkyEmu/cgb_boot.bin
+    required: false
+    hle_fallback: true
+    aliases: [gbc_bios.bin, cgb0_boot.bin, cgb_agb_boot.bin]
+    source_ref: "src/gb.h:1593-1596, 1605-1608"
+
+  - name: dmg_rom.bin
+    description: DMG boot ROM
+    path: SkyEmu/dmg_rom.bin
+    required: false
+    hle_fallback: true
+    aliases: [dmg0_rom.bin, gb_bios.bin]
+    source_ref: "src/gb.h:1601-1603"
+
+  - name: gba_bios.bin
+    description: GBA BIOS
+    path: SkyEmu/gba_bios.bin
+    required: false
+    hle_fallback: true
+    source_ref: "src/gba.h:1726-1730"
+
+  - name: nds7.bin
+    description: NDS ARM7 BIOS
+    path: SkyEmu/nds7.bin
+    required: false
+    hle_fallback: true
+    source_ref: "src/nds.h:3088-3089"
+
+  - name: nds9.bin
+    description: NDS ARM9 BIOS
+    path: SkyEmu/nds9.bin
+    required: false
+    hle_fallback: true
+    source_ref: "src/nds.h:3091-3092"
+
+  - name: firmware.bin
+    description: NDS firmware
+    path: SkyEmu/firmware.bin
+    required: false
+    hle_fallback: true
+    source_ref: "src/nds.h:3094, 3200-3268"