ACP history mentions (#36551)

- **TEMP**
- **Update @-mentions to use new history**

Closes #ISSUE

Release Notes:

- N/A

crates/agent_settings/src/agent_settings.rs

@@ -15,6 +15,8 @@ pub use crate::agent_profile::*;
 
 pub const SUMMARIZE_THREAD_PROMPT: &str =
     include_str!("../../agent/src/prompts/summarize_thread_prompt.txt");
+pub const SUMMARIZE_THREAD_DETAILED_PROMPT: &str =
+    include_str!("../../agent/src/prompts/summarize_thread_detailed_prompt.txt");
 
 pub fn init(cx: &mut App) {
     AgentSettings::register(cx);