Assisted-by: Claude Opus 4.6 via pi

diff --git a/.pi/agent/AGENTS.md b/.pi/agent/AGENTS.md
index 6e51e10..d0253b2 100644
--- a/.pi/agent/AGENTS.md
+++ b/.pi/agent/AGENTS.md
@@ -1,5 +1,11 @@
 # Project conventions
 
+## Environment
+
+This project runs on the host Mac, not inside the ramekin container.
+Write and edit code here, but don't expect `bundle exec rake` or
+other runtime commands to work — the user tests locally.
+
 ## Ruby
 
 - No `frozen_string_literal` comments. Omit them from all Ruby files.
diff --git a/Gemfile.lock b/Gemfile.lock
index 1435373..186f700 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -35,4 +35,4 @@ DEPENDENCIES
   rake
 
 BUNDLED WITH
-   2.6.7
+   4.0.9