Add originator to otel metadata tags (#11232)

codex-rs/otel/tests/suite/manager_metrics.rs

@@ -58,6 +58,7 @@ fn manager_attaches_metadata_tags_to_metrics() -> Result<()> {
             TelemetryAuthMode::ApiKey.to_string(),
         ),
         ("model".to_string(), "gpt-5.1".to_string()),
+        ("originator".to_string(), "test_originator".to_string()),
         ("service".to_string(), "codex-cli".to_string()),
         ("session_source".to_string(), "cli".to_string()),
         ("source".to_string(), "tui".to_string()),