[feedback] Add source info into feedback metadata. (#7140)

Verified the source info is correctly attached based on whether it's cli
or vscode.

codex-rs/protocol/src/protocol.rs

@@ -1131,6 +1131,29 @@ pub enum SubAgentSource {
     Other(String),
 }
 
+impl fmt::Display for SessionSource {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            SessionSource::Cli => f.write_str("cli"),
+            SessionSource::VSCode => f.write_str("vscode"),
+            SessionSource::Exec => f.write_str("exec"),
+            SessionSource::Mcp => f.write_str("mcp"),
+            SessionSource::SubAgent(sub_source) => write!(f, "subagent_{sub_source}"),
+            SessionSource::Unknown => f.write_str("unknown"),
+        }
+    }
+}
+
+impl fmt::Display for SubAgentSource {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        match self {
+            SubAgentSource::Review => f.write_str("review"),
+            SubAgentSource::Compact => f.write_str("compact"),
+            SubAgentSource::Other(other) => f.write_str(other),
+        }
+    }
+}
+
 #[derive(Serialize, Deserialize, Clone, Debug, JsonSchema, TS)]
 pub struct SessionMeta {
     pub id: ConversationId,