Document sentBatches field in README and code

Update output examples to include sentBatches, add note explaining
it's always 0 since the SDK doesn't expose batch count tracking.

Co-Authored-By: Claude Opus 4.6 <[email protected]>

Author: MichaelGHSeg

e2e-cli/README.md

@@ -44,11 +44,13 @@ node dist/cli.js --input '{"writeKey":"...", ...}'
 ## Output Format
 
 ```json
-{ "success": true }
+{ "success": true, "sentBatches": 0 }
 ```
 
 On failure:
 
 ```json
-{ "success": false, "error": "description" }
+{ "success": false, "error": "description", "sentBatches": 0 }
 ```
+
+Note: `sentBatches` is always 0 — the React Native SDK does not expose batch count tracking. The field is present for compatibility with the `sdk-e2e-tests` CLIOutput interface.

e2e-cli/src/cli.ts

@@ -258,6 +258,7 @@ async function main() {
 
     client.cleanup();
 
+    // sentBatches: SDK doesn't expose batch count tracking
     output = { success: true, sentBatches: 0 };
   } catch (e) {
     const error = e instanceof Error ? e.message : String(e);