ci: update repomix config

Author: pythoninthegrass

{{cookiecutter.project_slug}}/repomix.config.json5

@@ -27,11 +27,14 @@
     "useGitignore": true,
     "useDefaultPatterns": true,
     "customPatterns": [
+      "**/.env",
       ".claude",
       ".editorconfig",
       ".gitignore",
       ".markdownlint.jsonc",
+      ".serena",
       ".vscode",
+      "CLAUDE.local.md",
       "CLAUDE.md",
       "LICENSE",
       "repomix.config.json5",