claudetool/onstart: add codebase analysis tool and basic memory support

This is a preliminary approach. Big high level questions include:

* should we keep the multichoice tool prompting?
* should we push the list of quidance files or respond with them during codereview?
* should we use the list of docs and build files at all?
* are there other files we should hint (e.g. editor settings, something from aider, etc.)?

We should probably also blog about dear_llm.md to stop the endless proliferation of new files.

Co-Authored-By: sketch <hello@sketch.dev>
diff --git a/experiment/experiment.go b/experiment/experiment.go
index 068f9d7..60bc0b5 100644
--- a/experiment/experiment.go
+++ b/experiment/experiment.go
@@ -32,6 +32,10 @@
 			Name:        "llm_review",
 			Description: "Add an LLM step to the codereview tool",
 		},
+		{
+			Name:        "memory",
+			Description: "Enable memory subsystem (dear_llm.md)",
+		},
 	}
 	byName = map[string]*Experiment{}
 )