pinwheel: Manage claude settings through nix

hosts/pinwheel/modules/ai/default.nix

@@ -6,6 +6,41 @@
 }:
 let
   enabled = config.mod.ai.enable;
+
+  # Shared statusline: show the logged-in account email.
+  statusLine = {
+    type = "command";
+    command = "jq -r '.oauthAccount.emailAddress' \"$CLAUDE_CONFIG_DIR/.claude.json\"";
+  };
+
+  # PostToolUse hook: echoes a JSON payload that injects a comment-policy
+  # reminder as additional context after every Write/Edit.
+  commentPolicyPayload = builtins.toJSON {
+    suppressOutput = true;
+    hookSpecificOutput = {
+      hookEventName = "PostToolUse";
+      additionalContext = "Comment policy: default to ZERO code comments. Review what you just wrote and delete any comment that narrates the change, restates the code, states the obvious, is tangential, or explains design/why rationale -- put that reasoning in your chat reply instead, never in the code. Never use em dashes or en dashes anywhere in file content; use a plain ASCII hyphen or reword.";
+    };
+  };
+
+  settings = builtins.toJSON {
+    inherit statusLine;
+    theme = "dark";
+    editorMode = "vim";
+    hooks = {
+      PostToolUse = [
+        {
+          matcher = "Write|Edit";
+          hooks = [
+            {
+              type = "command";
+              command = "echo ${lib.escapeShellArg commentPolicyPayload}";
+            }
+          ];
+        }
+      ];
+    };
+  };
 in
 {
   options = {
@@ -24,6 +59,9 @@ in
         wclaude = "CLAUDE_CONFIG_DIR=$HOME/.claude-personal claude";
         pclaude = "CLAUDE_CONFIG_DIR=$HOME/.claude-work claude";
       };
+
+      home.file.".claude-work/settings.json".text = settings;
+      home.file.".claude-personal/settings.json".text = settings;
     };
   };
 }