Add tree-sitter example to the eval (#29321)

Interesting things about this example:
* It's a useful, non-trivial change I made with the agent in Tree-sitter
* It runs fast
* It frequently showcases edit file errors
* It occasionally completely errors out due to errors parsing tool call
input JSON

Release Notes:

- N/A

typos.toml

@@ -45,7 +45,7 @@ extend-exclude = [
     # Spellcheck triggers on `|Fixe[sd]|` regex part.
     "script/danger/dangerfile.ts",
     # Eval examples for prompts and criteria
-    "crates/eval/examples/",
+    "crates/eval/src/examples/",
 ]
 
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