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.

tests/test_audit_regressions.py

@@ -4553,6 +4553,36 @@ class BundledFilesAreNotToSource(unittest.TestCase):
         }})
         self.assertEqual([row["status"] for row in rows], ["bundled"])
 
+    def test_a_held_bundled_file_is_not_packed(self):
+        """A file installed with the emulator is already on the user's
+        machine, so the pack leaves it out even when the collection holds it."""
+        sys.path.insert(0, str(ROOT / "scripts"))
+        import verify
+
+        entry = {"name": "n64.psh", "required": True, "in_repo": True,
+                 "emulator": "daedalusx64", "category": "bios", "bundled": True}
+        with mock.patch("packextras.unplaceable_extras", return_value={}):
+            verify._mark_unplaced({}, [entry], {})
+        self.assertFalse(entry["in_pack"])
+        self.assertIn("installed with its emulator", entry["omitted"])
+
+    def test_a_build_scope_keeps_it_for_the_other_build(self):
+        """PPSSPP's standalone release ships assets/, its libretro core does
+        not: bundled for one build, the entry still reaches a core's pack."""
+        sys.path.insert(0, str(ROOT / "scripts"))
+        from validation import deliverable
+
+        entries = [{"ref": "ppsspp-assets", "mode": "libretro"},
+                   {"name": "a.bin", "bundled": True, "mode": "standalone"},
+                   {"name": "b.bin", "bundled": True}]
+        self.assertEqual([e.get("ref") or e["name"] for e in deliverable(entries, False)],
+                         ["ppsspp-assets"])
+        self.assertEqual(deliverable(entries, True), [])
+
+    def test_the_pack_builder_skips_it(self):
+        source = (ROOT / "scripts" / "packextras.py").read_text(encoding="utf-8")
+        self.assertIn('if u.get("bundled"):', source)
+
 
 
 class AdlerValuesReadLikeTheDownloads(unittest.TestCase):