experiment: remove llm_review experiment and associated code

It creates confusion for the agent and doesn't provide much value.
Perhaps with better prompt engineering, but I can't invest
in that much right now.

Co-Authored-By: sketch <hello@sketch.dev>
Change-ID: s9f2a8c418876c498k
diff --git a/loop/agent.go b/loop/agent.go
index e934e97..f6cbe37 100644
--- a/loop/agent.go
+++ b/loop/agent.go
@@ -25,7 +25,6 @@
 	"sketch.dev/claudetool/browse"
 	"sketch.dev/claudetool/codereview"
 	"sketch.dev/claudetool/onstart"
-	"sketch.dev/experiment"
 	"sketch.dev/llm"
 	"sketch.dev/llm/ant"
 	"sketch.dev/llm/conversation"
@@ -874,11 +873,7 @@
 		}
 		a.codebase = codebase
 
-		llmCodeReview := codereview.NoLLMReview
-		if experiment.Enabled("llm_review") {
-			llmCodeReview = codereview.DoLLMReview
-		}
-		codereview, err := codereview.NewCodeReviewer(ctx, a.repoRoot, a.SketchGitBaseRef(), llmCodeReview)
+		codereview, err := codereview.NewCodeReviewer(ctx, a.repoRoot, a.SketchGitBaseRef())
 		if err != nil {
 			return fmt.Errorf("Agent.Init: codereview.NewCodeReviewer: %w", err)
 		}