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/claudetool/codereview/codereview.go b/claudetool/codereview/codereview.go
index 2745957..5d10d79 100644
--- a/claudetool/codereview/codereview.go
+++ b/claudetool/codereview/codereview.go
@@ -21,19 +21,12 @@
 	initialStatus   []fileStatus // git status of files at initial commit, absolute paths
 	reviewed        []string     // history of all commits which have been reviewed
 	initialWorktree string       // git worktree at initial commit, absolute path
-	llmReview       bool         // enables a subagent LLM review
 }
 
-const (
-	NoLLMReview = false
-	DoLLMReview = true
-)
-
-func NewCodeReviewer(ctx context.Context, repoRoot, sketchBaseRef string, llmReview bool) (*CodeReviewer, error) {
+func NewCodeReviewer(ctx context.Context, repoRoot, sketchBaseRef string) (*CodeReviewer, error) {
 	r := &CodeReviewer{
 		repoRoot:      repoRoot,
 		sketchBaseRef: sketchBaseRef,
-		llmReview:     llmReview,
 	}
 	if r.repoRoot == "" {
 		return nil, fmt.Errorf("NewCodeReviewer: repoRoot must be non-empty")