fix: decouple puzzle draft generation lifecycle

server-rs/crates/api-server/src/puzzle/draft.rs

@@ -1177,21 +1177,16 @@ pub(crate) fn find_puzzle_level_for_initial_asset_check<'a>(
         .or_else(|| levels.first())
 }
 
-pub(crate) async fn compile_puzzle_draft_with_initial_cover(
+pub(crate) async fn generate_puzzle_initial_cover_from_compiled_session(
     state: &PuzzleApiState,
     request_context: &RequestContext,
-    session_id: String,
+    compiled_session: PuzzleAgentSessionRecord,
     owner_user_id: String,
     prompt_text: Option<&str>,
     reference_image_src: Option<&str>,
     image_model: Option<&str>,
     now: i64,
 ) -> Result<PuzzleAgentSessionRecord, AppError> {
-    let compiled_session = state
-        .spacetime_client()
-        .compile_puzzle_agent_draft(session_id.clone(), owner_user_id.clone(), now)
-        .await
-        .map_err(map_puzzle_compile_error)?;
     let draft = compiled_session.draft.clone().ok_or_else(|| {
         AppError::from_status(StatusCode::BAD_REQUEST).with_details(json!({
             "provider": PUZZLE_AGENT_API_BASE_PROVIDER,
@@ -1419,7 +1414,7 @@ pub(crate) async fn compile_puzzle_draft_with_initial_cover(
     match state
         .spacetime_client()
         .select_puzzle_cover_image(PuzzleSelectCoverImageRecordInput {
-            session_id,
+            session_id: compiled_session.session_id.clone(),
             owner_user_id,
             level_id: Some(target_level.level_id),
             candidate_id: selected_candidate_id,