feat: packs leave out what the emulator installs

A file or tree installed with the emulator is already on the user's machine, so packs, install manifests and verify's pack count leave it out. bundled is scoped by mode like any entry: Dolphin's Sys and PPSSPP's assets ship with the standalone releases, not with the libretro cores, so they now follow the libretro build only and still reach RetroArch packs. PrimeHack, standalone only, ships its own Sys.

scripts/validation.py

@@ -525,6 +525,17 @@ def filter_files_by_mode(files: list[dict], standalone: bool) -> list[dict]:
     return result
 
 
+def deliverable(entries: list[dict], standalone: bool) -> list[dict]:
+    """The entries of one build a pack has to bring.
+
+    A file or tree installed with the emulator is already on the user's
+    machine: shipping it again only weighs the pack. `bundled` is scoped by
+    `mode` like any entry, so PPSSPP's assets, shipped by the standalone
+    release and not by the libretro core, still reach a RetroArch pack.
+    """
+    return [e for e in filter_files_by_mode(entries, standalone) if not e.get("bundled")]
+
+
 def find_validated_variant(
     file_entry: dict,
     db: dict,