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

.github/install_editorconfig-checker.sh

@@ -0,0 +1,50 @@
+#!/bin/bash
+set -e
+
+echo "Downloading editorconfig-checker..."
+
+BASE_URL="https://github.com/editorconfig-checker/editorconfig-checker/releases/latest/download"
+
+# Detect OS and architecture
+OS="$(uname -s)"
+ARCH="$(uname -m)"
+case "$OS" in
+Darwin)
+  [ "$ARCH" = "arm64" ] && ARCH="arm64" || ARCH="amd64"
+  URL="$BASE_URL/ec-darwin-${ARCH}.tar.gz"
+  ;;
+Linux)
+  [ "$ARCH" = "aarch64" ] && ARCH="arm64" || ARCH="amd64"
+  URL="$BASE_URL/ec-linux-${ARCH}.tar.gz"
+  ;;
+*)
+  echo "Unsupported OS: $OS"
+  exit 1
+  ;;
+esac
+
+TMPDIR="$(mktemp -d)"
+trap 'rm -rf "$TMPDIR"' EXIT
+
+curl -L "$URL" | tar -xz -C "$TMPDIR"
+
+# Choose install directory
+INSTALL_DIR="${XDG_BIN_HOME:-$HOME/bin}"
+[ -d "$INSTALL_DIR" ] || INSTALL_DIR="/usr/local/bin"
+
+echo "Installing to $INSTALL_DIR..."
+
+mkdir -p "$INSTALL_DIR" 2>/dev/null || true
+
+if mv "$TMPDIR/bin/ec" "$INSTALL_DIR/editorconfig-checker" 2>/dev/null; then
+  echo "✓ Installed editorconfig-checker to $INSTALL_DIR"
+elif sudo mv "$TMPDIR/bin/ec" "$INSTALL_DIR/editorconfig-checker" 2>/dev/null; then
+  echo "✓ Installed editorconfig-checker to $INSTALL_DIR (with sudo)"
+else
+  echo "Could not install to $INSTALL_DIR, using local copy"
+  mkdir -p bin
+  mv "$TMPDIR/bin/ec" bin/editorconfig-checker
+  echo "Add $(pwd)/bin to your PATH to use editorconfig-checker"
+fi
+
+echo "Installation complete!"

.github/workflows/pr-lint.yml

@@ -8,11 +8,12 @@ on:
   pull_request:
     branches: [master, main]
 
-permissions:
-  contents: read
-  packages: read
-  statuses: write
-
 jobs:
-  SuperLinter:
-    uses: ivuorinen/actions/pr-lint@625c37446b1c7e219755a40807f825c9283f6e05 # 25.7.7
+  Linter:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: read
+      statuses: write
+    steps:
+      - uses: ivuorinen/actions/pr-lint@625c37446b1c7e219755a40807f825c9283f6e05 # 25.7.7