feat: refactor plugin architecture, enhance linting, CI & tooling

- Major refactor of core Fish functions for modularity, caching, and error handling
- Improved `.editorconfig` and Makefile for stricter formatting and linting standards
- Expanded linting support: added EditorConfig checks, auto-install for missing tools, and Makefile targets
- Enhanced CI workflow with clearer permissions and job steps in GitHub Actions
- Updated documentation in `README.md` and `CLAUDE.md` to reflect new features, advanced developer tools, and contribution guidelines
- Improved Node.js version manager detection, switching, and installation logic
- Added/updated utility functions for configuration, silent mode, notifications, and version extraction
- Various bug fixes, code quality improvements, and expanded test coverage

functions/nvm_extract_version.fish

@@ -35,11 +35,15 @@ function nvm_extract_version -a file_path -d "Extract Node.js version from vario
             # Standard .nvmrc or .node-version file
             set -l version (cat "$actual_file" | string trim)
             if test -n "$version"
+                # Strip leading 'v'
+                set version (string replace -r '^v' '' "$version")
                 # Handle nvm aliases
                 switch "$version"
                     case 'lts/*' lts latest stable node
                         if command -q nvm
                             set version (nvm version-remote "$version" 2>/dev/null | string replace 'v' '')
+                        else if command -q node
+                            set version (node -v 2>/dev/null | string replace -r '^v' '')
                         end
                 end
                 echo "$version"