experiment: make memory (dear_llm.md) always enabled

Co-Authored-By: sketch <hello@sketch.dev>
Change-ID: s2bbca9bb0adeb9eek
diff --git a/experiment/experiment.go b/experiment/experiment.go
index 465b363..a038f60 100644
--- a/experiment/experiment.go
+++ b/experiment/experiment.go
@@ -33,10 +33,7 @@
 			Name:        "llm_review",
 			Description: "Add an LLM step to the codereview tool",
 		},
-		{
-			Name:        "memory",
-			Description: "Enable memory subsystem (dear_llm.md)",
-		},
+
 		{
 			Name:        "kb",
 			Description: "Enable knowledge_base tool",