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/stella.yml

@@ -1,57 +1,18 @@
 emulator: Stella
-type: libretro
-source: "https://github.com/libretro/stella2014-libretro"
-profiled_date: "2026-03-18"
-core_version: "6.6"
+type: alias
+alias_of: stella2014
+source: "https://github.com/libretro/stella-libretro"
+profiled_date: "2026-03-25"
+core_version: "3.9.3"
 display_name: "Atari - 2600 (Stella)"
 cores:
   - stella
-  - stella2014
-  - stella2023
 systems:
   - atari-2600
 
-notes: |
-  Stella is an Atari 2600 (VCS) emulator. The libretro port available is
-  stella2014, which is a fork frozen at the 2014 codebase. The upstream
-  "stella-libretro" repo redirects to stella2014-libretro. There is no
-  separate stella2023 libretro core published at this time.
-
-  The Atari 2600 console has no BIOS ROM. Games run directly on the
-  hardware with no boot firmware.
-
-  The Starpath/Arcadia Supercharger add-on had a 2K BIOS ROM on the
-  physical hardware. Stella does NOT load this BIOS from an external
-  file. Instead, the core contains a built-in dummy BIOS
-  (ourDummyROMCode, 294 bytes in CartAR.cxx) that simulates the
-  Supercharger load sequence. The initializeROM() function copies this
-  dummy code into the ROM bank (bank 3) at reset, sets up the 6502
-  reset vector to 0xF80A, and handles multiload via a hotspot at
-  address 0x1850.
-
-  The "fastscbios" setting (offset 109 in the dummy ROM) controls
-  whether the SC load progress bars are shown (0x00) or skipped
-  (0xFF). This is toggled automatically during ROM format detection
-  (Console.cxx:119-120).
-
-  The real Supercharger BIOS ROM (MD5 4565c1a7abce773e53c75b35414adefd)
-  is recognized in DefProps.hxx as a known cartridge entry but is not
-  required or loaded as a system file.
-
-  The libretro interface (retro_set_environment) does not call
-  RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY and declares no firmware
-  requirements. No core option references BIOS loading.
-
-files: []
-
-platform_details:
-  supercharger_emulation:
-    source_ref: "stella/src/emucore/CartAR.cxx, CartAR.hxx"
-    notes: |
-      The Supercharger (type AR) uses 4 banks: 3x 2K RAM + 1x 2K ROM.
-      The ROM bank is filled with ourDummyROMCode at reset. SC games
-      are multi-load images (8448 bytes per load: 8192 data + 256 header).
-      loadIntoRAM() handles loading game data when the hotspot at 0x1850
-      is accessed with the ROM bank mapped. The bank switching byte and
-      start address are written to zero-page RAM (0xFE, 0xFF, 0x80) for
-      the dummy BIOS to read.
+note: |
+  Identical codebase to stella2014-libretro. Both repos share the same HEAD
+  commit and produce a binary reporting library_name "Stella 2014". The
+  stella_libretro.info incorrectly lists display_version "6.6"; the actual
+  embedded version is 3.9.3. See stella2014.yml for firmware requirements
+  and KidVid audio files.