Restore ShadowTree commit-exhaustion protection

React Native 0.85.3 upstreamed the equivalent of our old react-native+0.79.2.patch — ShadowTree::commit() now caps optimistic retries at MAX_COMMIT_ATTEMPTS_BEFORE_LOCKING and falls back to an exclusive recursive lock (ReactCommon/react/renderer/mounting/ShadowTree.cpp) — but only behind the preventShadowTreeCommitExhaustion feature flag, which defaults to false. Enable the flag with a 1-line patch so the RN upgrade doesn't silently drop the crash protection. Delete this patch when upstream flips the default.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: peachbits

patches/react-native+0.85.3.patch

@@ -0,0 +1,13 @@
+diff --git a/node_modules/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlagsDefaults.h b/node_modules/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlagsDefaults.h
+index 8146298..4fd688b 100644
+--- a/node_modules/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlagsDefaults.h
++++ b/node_modules/react-native/ReactCommon/react/featureflags/ReactNativeFeatureFlagsDefaults.h
+@@ -300,7 +300,7 @@ class ReactNativeFeatureFlagsDefaults : public ReactNativeFeatureFlagsProvider {
+   }
+ 
+   bool preventShadowTreeCommitExhaustion() override {
+-    return false;
++    return true;
+   }
+ 
+   bool redBoxV2Android() override {