feat: keep platform-built cores out of all_libretro

Recalbox compiles libretro/mame at 0.258 and 0.278 itself; typed
libretro, both profiles were resolved for every all_libretro platform
although the buildbot RetroArch installs from has neither. A profile
now names the platforms that build it (built_by), and is reached only
when a platform lists it by name.

scripts/common.py

@@ -1694,12 +1694,18 @@ def resolve_platform_cores(
     """
     cores_config = config.get("cores")
 
-    if cores_config == "all_libretro":
-        result = {
+    def every_libretro() -> set[str]:
+        # A build only some platforms compile (built_by) is reached by name:
+        # the buildbot RetroArch installs from does not publish it.
+        return {
             name
             for name, p in profiles.items()
             if "libretro" in p.get("type", "") and p.get("type") != "alias"
+            and not p.get("built_by")
         }
+
+    if cores_config == "all_libretro":
+        result = every_libretro()
     elif isinstance(cores_config, list):
         core_set = {str(c) for c in cores_config}
         index = upstream_profile_index(profiles)
@@ -1712,11 +1718,7 @@ def resolve_platform_cores(
         # profiles with explicitly listed standalone cores (e.g. RetroDECK
         # ships RetroArch + standalone emulators)
         if "all_libretro" in core_set or "retroarch" in core_set:
-            result |= {
-                name
-                for name, p in profiles.items()
-                if "libretro" in p.get("type", "") and p.get("type") != "alias"
-            }
+            result |= every_libretro()
     else:
         # Fallback: system ID intersection with normalization
         norm_plat_systems = {_norm_system_id(s) for s in config.get("systems", {})}
@@ -1725,6 +1727,7 @@ def resolve_platform_cores(
             for name, p in profiles.items()
             if {_norm_system_id(s) for s in p.get("systems", [])} & norm_plat_systems
             and p.get("type") != "alias"
+            and not p.get("built_by")
         }
 
     if target_cores is not None:

scripts/scraper/mame_hash_scraper.py

@@ -336,6 +336,7 @@ def release_profile(
     source_commit: str,
     cores: list[str],
     reference: dict[str, Any],
+    built_by: list[str],
 ) -> dict[str, Any]:
     """A profile for one MAME release a platform builds, from its own source.
 
@@ -376,6 +377,7 @@ def release_profile(
         "core_version": version,
         "display_name": f"Arcade (MAME {version})",
         "cores": cores,
+        "built_by": built_by,
         "systems": list(reference.get("systems") or []),
         "notes": (
             f"libretro/mame built at the {version} release. BIOS root sets "
@@ -398,7 +400,8 @@ def _write_release(args: argparse.Namespace) -> None:
         raise RuntimeError(f"no BIOS root set read at {args.release}")
     reference = yaml_load((_EMULATORS_DIR / "mame.yml").read_text(encoding="utf-8"))
     profile = release_profile(
-        args.release, bios_sets, commit, args.source_commit, args.core, reference
+        args.release, bios_sets, commit, args.source_commit, args.core, reference,
+        args.built_by,
     )
     text = yaml.safe_dump(profile, sort_keys=False, allow_unicode=True, width=100)
     write_text_atomic(str(args.profile), text)
@@ -429,12 +432,16 @@ def build_parser() -> argparse.ArgumentParser:
         "release profile",
         "write the profile of one MAME release a platform builds "
         "(e.g. --release mame0278 --profile emulators/mame0278.yml "
-        "--source-commit <libretro/mame sha> --core mame0278)",
+        "--source-commit <libretro/mame sha> --core mame0278 --built-by recalbox)",
     )
     release.add_argument("--release", help="mamedev/mame tag, such as mame0278")
     release.add_argument("--profile", type=Path, help="profile file to write")
     release.add_argument("--source-commit", help="libretro/mame commit the platform builds")
     release.add_argument("--core", action="append", default=[], help="core name, repeatable")
+    release.add_argument(
+        "--built-by", action="append", default=[],
+        help="platform that compiles this build, repeatable",
+    )
     return parser
 
 
@@ -450,6 +457,7 @@ def main() -> None:
             flag for flag, value in (
                 ("--release", args.release), ("--profile", args.profile),
                 ("--source-commit", args.source_commit), ("--core", args.core),
+                ("--built-by", args.built_by),
             ) if not value
         ]
         if missing: