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/snes9x2002.yml

@@ -0,0 +1,23 @@
+emulator: Snes9x 2002
+type: libretro
+core_classification: frozen_snapshot
+source: "https://github.com/libretro/snes9x2002"
+upstream: "https://github.com/snes9xgit/snes9x"
+profiled_date: "2026-03-25"
+core_version: "7.2.0"
+display_name: "Nintendo - SNES / SFC (Snes9x 2002)"
+cores:
+  - snes9x2002
+systems:
+  - snes
+  - sufami-turbo
+  - satellaview
+
+notes: |
+  Frozen snapshot of Snes9x 1.39 via PocketSNES, optimized for ARM.
+  SPC700 IPL ROM (64 bytes) embedded in globals.c:283 as APUROM[64].
+  All ROM I/O via memstream (snes9x.h:54-57). The core never calls
+  GET_SYSTEM_DIRECTORY and performs no file I/O from the system directory.
+
+exclusion_note: "SPC700 IPL ROM embedded in binary (globals.c:283); no system_directory access"
+files: []