chore: update scripts/build_release.py for the caption pixel gate

scripts/build_release.py

@@ -163,11 +163,17 @@ def main() -> int:
                 raise SystemExit("Release demo produced no on-camera caption receipt")
             recorded = json.loads(caption_receipt.read_text(encoding="utf-8"))
             onscreen = [str(line) for line in (recorded.get("captions") or [])]
-            if recorded.get("releaseDelta") != release_delta or not any(release_delta in line for line in onscreen):
+            # A pushed string is not proof of pixels. Only captions the demo measured as a painted,
+            # on-top, in-frame bar (style + elementFromPoint + band pixel change) count as on camera.
+            verified = [str(item.get("text")) for item in (recorded.get("captionsVerified") or [])
+                        if item.get("visible") is True and item.get("bandChanged") is True]
+            if recorded.get("releaseDelta") != release_delta or not any(release_delta in line for line in verified):
                 raise SystemExit("Release demo did not state the declared release delta on camera")
             for required in DEMO_REQUIRED_CAPTIONS:
                 if not any(required in line for line in onscreen):
                     raise SystemExit(f"Release demo is missing a required on-camera caption: {required}")
+                if not any(required in line for line in verified):
+                    raise SystemExit(f"Release demo caption never painted on screen: {required}")
         finally:
             server.terminate()
             try: