Greptile Summary

Enabled system.notify command for Android and implemented notification event pipeline from Android listener to gateway system events.

• Added NODE_SYSTEM_NOTIFY_COMMAND to Android platform defaults in src/gateway/node-command-policy.ts:85
• Connected Android notification listener to node event sink in apps/android/app/src/main/java/ai/openclaw/android/NodeRuntime.kt:306-312 via init block
• Emit notifications.changed events on post/remove in apps/android/app/src/main/java/ai/openclaw/android/node/DeviceNotificationListenerService.kt:137-169 with full notification metadata
• Handle notifications.changed in gateway node event pipeline (src/gateway/server-node-events.ts:457-490) with proper validation and summary formatting
• Comprehensive test coverage for event handling in src/gateway/server-node-events.test.ts:353-410

The implementation is clean, well-tested, and follows existing patterns for node event handling.

Confidence Score: 5/5

• This PR is safe to merge with minimal risk
• The implementation follows established patterns for node event handling, includes comprehensive test coverage for both gateway event handling and integration, properly validates inputs, and only enables functionality already present in the codebase. All changes are additive with no breaking modifications.
• No files require special attention

_{Last reviewed commit: 408b665}

Landed via temp rebase onto main.

• Gate: skipped full gate per maintainer request in-thread; relied on targeted tests from PR updates.
• Land commit: 021b755
• Merge commit: 3899c89