refactor: share the baseline verdict with the manifest

scripts/slots.py

@@ -366,6 +366,20 @@ def pack_overrides(
     return overrides
 
 
+def apply_override(
+    override: str | None, local_path: str | None, status: str
+) -> tuple[str | None, str]:
+    """The file a pack serves at a destination once its slot is settled.
+
+    An entry the platform stores outside the collection, or a release asset
+    fetched for its declared hash, keeps its own answer. The builder and the
+    install manifest both read this.
+    """
+    if override and status not in ("external", "release_asset"):
+        return override, "slot_arbitrated"
+    return local_path, status
+
+
 def _strongest(claims: list[Claim]) -> Claim:
     """The profile claim with the strongest proof; the first emulator breaks ties.