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/retrodream.yml

@@ -1,60 +1,54 @@
 emulator: RetroDream
 type: libretro
+core_classification: community_fork
 source: "https://github.com/libretro/redream-next"
-profiled_date: "2026-03-18"
+upstream: "https://github.com/inolen/redream"
+profiled_date: "2026-03-25"
 core_version: "Git"
 display_name: "Sega - Dreamcast (RetroDream)"
+cores:
+  - retrodream
 systems:
   - sega-dreamcast
 
 notes: |
-  Fork of the final open-source redream release (pre-relicense). Experimental
-  core with no HLE BIOS -- real BIOS files are required to boot games.
-  Flycast is recommended over this core for actual gameplay.
+  Fork of the last GPLv3 release of redream (inolen) before it went closed-source.
+  The core has HLE bootstrap -- when boot.bin is missing, bios_invalid_instr()
+  traps at PC=0x0 and calls bios_boot(), which loads IP.BIN and 1ST_READ.BIN
+  directly from disc, sets up syscall vectors, and starts execution at 0xac008300.
 
-  The libretro core sets appdir to the RetroArch system directory
-  (src/host/retro_host.c:216-217). boot.bin and flash.bin are loaded
-  directly from appdir (src/guest/rom/boot.c:17, src/guest/rom/flash.c:30).
+  The fork sets appdir to the RetroArch system directory root
+  (retro_host.c:216-217), unlike the upstream which appends /dc
+  (upstream retro_host.c:196-198). The .info still declares dc/ prefix paths
+  matching the upstream, not this fork.
 
-  The .info file declares paths as dc/boot.bin and dc/flash.bin, which means
-  RetroArch resolves them under {system_dir}/dc/.
+  boot.bin is validated against four known MD5 hashes (boot.c:25-30).
+  Validation failure logs a warning but the core continues via HLE.
 
-  boot.bin is validated against four known MD5 hashes at load time
-  (src/guest/rom/boot.c:25-30). If validation fails, the core logs a warning
-  but still attempts to run via HLE syscall hooks (bios.c:440-447).
-
-  flash.bin is read/write -- the core saves modified flash data back to disk
-  on shutdown (src/guest/rom/flash.c:197-199).
-
-  Boot ROM size: 2 MB (0x200000). Flash ROM size: 128 KB (0x20000).
+  flash.bin is read/write. If missing, bios_validate_flash() resets all
+  partitions to defaults. Saved back to disk on shutdown (flash.c:197-199).
 
 files:
   - name: "boot.bin"
     system: sega-dreamcast
-    path: "dc/boot.bin"
-    required: true
-    size: 2097152  # 2 MB (0x200000)
+    path: "boot.bin"
+    required: false
+    hle_fallback: true
+    size: 2097152
+    validation: [size, md5]
     md5:
-      - e10c53c2f8b90bab96ead2d368858623  # original US/EU BIOS
-      - a5c6a00818f97c5e3e91569ee22416dc  # Chinese BIOS
-      - 37c921eb47532cae8fb70e5d987ce91c  # Japanese BIOS
-      - f2cd29d09f3e29984bcea22ab2e006fe  # revised BIOS without MIL-CD
-    note: "Dreamcast boot ROM. Validated against known MD5 hashes at load."
+      - a5c6a00818f97c5e3e91569ee22416dc
+      - 37c921eb47532cae8fb70e5d987ce91c
+      - f2cd29d09f3e29984bcea22ab2e006fe
+      - e10c53c2f8b90bab96ead2d368858623
+    note: "Dreamcast boot ROM. Four known variants accepted."
     source_ref: "src/guest/rom/boot.c:12-80"
 
   - name: "flash.bin"
     system: sega-dreamcast
-    path: "dc/flash.bin"
-    required: true
-    size: 131072  # 128 KB (0x20000)
-    md5:
-      - 0a93f7940c455905bea6e392dfde92a4
-    note: "Dreamcast flash memory (date, time, language). Written back on shutdown."
-    source_ref: "src/guest/rom/flash.c:25-35"
-
-platform_details:
-  dreamcast:
-    bios_size: 2097152     # 2 MB
-    flash_size: 131072     # 128 KB
-    hle_available: false
-    source_ref: "src/guest/rom/boot.c, src/guest/rom/flash.c"
+    path: "flash.bin"
+    required: false
+    size: 131072
+    validation: [size]
+    note: "Dreamcast flash memory. Written back on shutdown."
+    source_ref: "src/guest/rom/flash.c:25-71"