assistant: Display edits from scripts in panel (#26441)

https://github.com/user-attachments/assets/a486ff2a-4aa1-4c0d-be6c-1dea2a8d60c8
 
- [x] Track buffer changes in `ScriptingSession`
- [x] Show edited files in thread

Reviewing diffs and displaying line counts will be part of an upcoming
PR.

Release Notes:

- N/A

---------

Co-authored-by: Antonio Scandurra <me@as-cii.com>

crates/scripting_tool/src/scripting_tool.rs

@@ -1,9 +1,7 @@
-mod session;
+mod scripting_session;
 
-use project::Project;
-use session::*;
+pub use scripting_session::*;
 
-use gpui::{App, AppContext as _, Entity, Task};
 use schemars::JsonSchema;
 use serde::Deserialize;
 
@@ -24,40 +22,9 @@ impl ScriptingTool {
         serde_json::to_value(&schema).unwrap()
     }
 
-    pub fn run(
-        &self,
+    pub fn deserialize_input(
         input: serde_json::Value,
-        project: Entity<Project>,
-        cx: &mut App,
-    ) -> Task<anyhow::Result<String>> {
-        let input = match serde_json::from_value::<ScriptingToolInput>(input) {
-            Err(err) => return Task::ready(Err(err.into())),
-            Ok(input) => input,
-        };
-
-        // TODO: Store a session per thread
-        let session = cx.new(|cx| ScriptingSession::new(project, cx));
-        let lua_script = input.lua_script;
-
-        let (script_id, script_task) =
-            session.update(cx, |session, cx| session.run_script(lua_script, cx));
-
-        cx.spawn(|cx| async move {
-            script_task.await;
-
-            let message = session.read_with(&cx, |session, _cx| {
-                // Using a id to get the script output seems impractical.
-                // Why not just include it in the Task result?
-                // This is because we'll later report the script state as it runs,
-                // currently not supported by the `Tool` interface.
-                session
-                    .get(script_id)
-                    .output_message_for_llm()
-                    .expect("Script shouldn't still be running")
-            })?;
-
-            drop(session);
-            Ok(message)
-        })
+    ) -> Result<ScriptingToolInput, serde_json::Error> {
+        serde_json::from_value(input)
     }
 }