chore: add eclint for editorconfig linting and fix violations

- Install eclint ^2.8.1 for editorconfig validation and fixing
- Add .eclintignore to exclude generated files and dependencies
- Add npm scripts: lint:editorconfig and lint:editorconfig:fix
- Fix indentation issues in CONTRIBUTING.md (3 spaces -> 2 spaces)
- Fix code alignment in scanner.c to match editorconfig rules
- Regenerate parser after scanner.c formatting changes

package.json

@@ -16,6 +16,8 @@
     "lint": "npx mega-linter-runner",
     "lint:yaml": "yamllint .",
     "lint:markdown": "markdownlint . --config .markdownlint.json --ignore node_modules --fix",
+    "lint:editorconfig": "eclint check .",
+    "lint:editorconfig:fix": "eclint fix .",
     "format": "prettier --write .",
     "format:check": "prettier --check .",
     "precommit": "pre-commit run --all-files",
@@ -37,6 +39,7 @@
     "tree-sitter-bash": "^0.25.0"
   },
   "devDependencies": {
+    "eclint": "^2.8.1",
     "markdownlint-cli": "^0.46.0",
     "nodemon": "^3.0.1",
     "prettier": "^3.6.2",