Add cwd as an optional field to thread/list (#11651)

Add's the ability to filter app-server thread/list by cwd

codex-rs/app-server-protocol/src/protocol/v2.rs

@@ -1708,6 +1708,10 @@ pub struct ThreadListParams {
     /// If false or null, only non-archived threads are returned.
     #[ts(optional = nullable)]
     pub archived: Option<bool>,
+    /// Optional cwd filter; when set, only threads whose session cwd exactly
+    /// matches this path are returned.
+    #[ts(optional = nullable)]
+    pub cwd: Option<String>,
 }
 
 #[derive(Serialize, Deserialize, Debug, Clone, Copy, PartialEq, Eq, JsonSchema, TS)]