claude-code: add PostToolUse hook for session rename suggestion

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

home/programs/claude-code/default.nix

@@ -46,6 +46,19 @@
           "Read(~/.ssh/*)"
         ];
       };
+      hooks = {
+        PostToolUse = [
+          {
+            matcher = "EnterPlanMode";
+            hooks = [
+              {
+                type = "command";
+                command = "echo 'A plan is being created. If this session has not been renamed yet, suggest a concise, descriptive session name based on the conversation so far and ask the user to run /rename <suggested-name>.'";
+              }
+            ];
+          }
+        ];
+      };
       statusLine = {
         type = "command";
         command = ''input=$(cat); echo "$(basename "$(echo "$input" | jq -r '.workspace.current_dir')") | $(echo "$input" | jq -r '.model.display_name')"'';