chore: rework unified exec events (#7775)

codex-rs/protocol/src/protocol.rs

@@ -518,6 +518,9 @@ pub enum EventMsg {
     /// Incremental chunk of output from a running command.
     ExecCommandOutputDelta(ExecCommandOutputDeltaEvent),
 
+    /// Terminal interaction for an in-progress command (stdin sent and stdout observed).
+    TerminalInteraction(TerminalInteractionEvent),
+
     ExecCommandEnd(ExecCommandEndEvent),
 
     /// Notification that the agent attached a local image via the view_image tool.
@@ -1455,6 +1458,17 @@ pub struct ExecCommandOutputDeltaEvent {
     pub chunk: Vec<u8>,
 }
 
+#[serde_as]
+#[derive(Debug, Clone, Deserialize, Serialize, PartialEq, JsonSchema, TS)]
+pub struct TerminalInteractionEvent {
+    /// Identifier for the ExecCommandBegin that produced this chunk.
+    pub call_id: String,
+    /// Process id associated with the running command.
+    pub process_id: String,
+    /// Stdin sent to the running session.
+    pub stdin: String,
+}
+
 #[derive(Debug, Clone, Deserialize, Serialize, JsonSchema, TS)]
 pub struct BackgroundEventEvent {
     pub message: String,