Return the prompt hash in upload responses (#44325)

## What changed

Add nullable `promptHash` to the upload response, populated from the uploaded `prompt_hash` tag. It identifies the whitespace-normalized SHA-256 of the session base instructions, excludes later developer messages, and is `null` when the reported rollout has no prompt metadata.

Update the protocol schemas, precomputed exports, and generated TypeScript and Python types.

GitOrigin-RevId: 6fa70fbe7a06604ac1cd0ea363eb4f192083dad9

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

@@ -27,4 +27,9 @@ pub struct FeedbackUploadParams {
 #[ts(export_to = "v2/")]
 pub struct FeedbackUploadResponse {
     pub thread_id: String,
+    /// Whitespace-normalized SHA-256 of the session base instructions, matching the
+    /// uploaded `prompt_hash` tag. Does not include later developer messages.
+    /// Null when the reported rollout has no prompt metadata.
+    #[serde(default)]
+    pub prompt_hash: Option<String>,
 }