fix: keep generation progress out of chat history

server-rs/crates/spacetime-module/src/puzzle.rs

@@ -659,12 +659,6 @@ fn compile_puzzle_agent_draft_tx(
             updated_at: compiled_at,
         },
     );
-    append_system_message(
-        ctx,
-        &row.session_id,
-        input.compiled_at_micros,
-        "拼图结果页草稿已生成。",
-    )?;
     get_puzzle_agent_session_tx(
         ctx,
         PuzzleAgentSessionGetInput {
@@ -1260,25 +1254,6 @@ fn build_puzzle_suggested_actions(
     }
 }
 
-fn append_system_message(
-    ctx: &TxContext,
-    session_id: &str,
-    created_at_micros: i64,
-    text: &str,
-) -> Result<(), String> {
-    let message_id = format!("{session_id}-system-{created_at_micros}");
-    ensure_message_missing(ctx, &message_id)?;
-    ctx.db.puzzle_agent_message().insert(PuzzleAgentMessageRow {
-        message_id,
-        session_id: session_id.to_string(),
-        role: PuzzleAgentMessageRole::Assistant,
-        kind: PuzzleAgentMessageKind::ActionResult,
-        text: text.to_string(),
-        created_at: Timestamp::from_micros_since_unix_epoch(created_at_micros),
-    });
-    Ok(())
-}
-
 fn ensure_session_missing(ctx: &TxContext, session_id: &str) -> Result<(), String> {
     if ctx
         .db