feat(nix): add git ignore patterns for Claude settings

- Added `**/.claude/settings.local.json` and `CLAUDE.local.md` to Git ignore configuration in `default.nix`.
- Helps exclude machine-specific and local configuration files from version control.

modules/home/tools/git/default.nix

@@ -36,6 +36,10 @@ in
         key = cfg.signingKey;
         inherit (cfg) signByDefault;
       };
+      ignores = [
+        "**/.claude/settings.local.json"
+        "CLAUDE.local.md"
+      ];
       settings = {
         user = {
           email = cfg.userEmail;