diff --git a/common/claude/CLAUDE.md b/common/claude/CLAUDE.md
index 3aa76c1..6d02487 100644
--- a/common/claude/CLAUDE.md
+++ b/common/claude/CLAUDE.md
@@ -166,3 +166,12 @@ here wants a commit and reaches every machine at the next `install`.
 - Measure before concluding, and when a previous conclusion turns out to have
   been reached from bad data, **record both the correction and why the original
   reasoning was unsound** — otherwise someone re-opens it.
+- **US English spelling everywhere** — code, comments, docs, commit messages,
+  prose. `meters`, `normalize`, `stabilize`, `recognize`, `license`, `modeling`,
+  `maneuver`, `behavior`, `analyze`. British spellings keep slipping into
+  generated text, so check before handing work over.
+- **Plain prose, not persuasive.** Write the fact and stop. One line of comment
+  where one line does it. Commit messages say what changed, not why it was a
+  good idea. No bold for emphasis, no aphorisms, no "X is not Y" constructions,
+  no sentence whose only job is to make a point land. Concrete examples that
+  explain something are welcome; salesmanship is not.
diff --git a/common/lazygit/config.yml b/common/lazygit/config.yml
index a2af6f8..654dd16 100644
--- a/common/lazygit/config.yml
+++ b/common/lazygit/config.yml
@@ -4,3 +4,9 @@ git:
     - pager: ""   # empty = lazygit's built-in diff, which follows the terminal theme
     - externalDiffCommand: difft --color=always
     - pager: delta --dark --paging=never
+  # Cycle between these with | in any diff view.
+  diffRenderers:
+    - colorArg: always
+      command: delta --dark --paging=never
+    - command: difft --color=always
+      type: extDiff