Include EditAgent's raw output when inspecting thread (#30337)

This allows us to debug the raw edits that were generated when people
report feedback, when running evals and when opening the thread as
Markdown.

Release Notes:

- Improved debug output for agent threads.

crates/assistant_tools/src/edit_agent/edit_parser.rs

@@ -1,4 +1,6 @@
 use derive_more::{Add, AddAssign};
+use schemars::JsonSchema;
+use serde::{Deserialize, Serialize};
 use smallvec::SmallVec;
 use std::{cmp, mem, ops::Range};
 
@@ -13,7 +15,9 @@ pub enum EditParserEvent {
     NewTextChunk { chunk: String, done: bool },
 }
 
-#[derive(Clone, Debug, Default, PartialEq, Eq, Add, AddAssign)]
+#[derive(
+    Clone, Debug, Default, PartialEq, Eq, Add, AddAssign, Serialize, Deserialize, JsonSchema,
+)]
 pub struct EditParserMetrics {
     pub tags: usize,
     pub mismatched_tags: usize,

crates/assistant_tools/src/edit_agent/evals.rs

@@ -1116,7 +1116,7 @@ fn eval(iterations: usize, expected_pass_ratio: f32, mut eval: EvalInput) {
     while let Ok(output) = rx.recv() {
         match output {
             Ok(output) => {
-                cumulative_parser_metrics += output.sample.edit_output._parser_metrics.clone();
+                cumulative_parser_metrics += output.sample.edit_output.parser_metrics.clone();
                 eval_outputs.push(output.clone());
                 if output.assertion.score < 80 {
                     failed_count += 1;
@@ -1197,9 +1197,9 @@ impl Display for EvalOutput {
         writeln!(
             f,
             "Parser Metrics:\n{:#?}",
-            self.sample.edit_output._parser_metrics
+            self.sample.edit_output.parser_metrics
         )?;
-        writeln!(f, "Raw Edits:\n{}", self.sample.edit_output._raw_edits)?;
+        writeln!(f, "Raw Edits:\n{}", self.sample.edit_output.raw_edits)?;
         Ok(())
     }
 }