feat(parser): add Elixir language support

- [x] Add Elixir documentation extraction (@doc and @moduledoc attributes)
- [x] Add Elixir symbol extraction (modules, functions, macros, structs, protocols)
- [x] Add tree-sitter Elixir language parser integration
- [x] Add Elixir language detection for .ex and .exs file extensions
- [x] Add Elixir symbol extraction tests
- [x] Update language support table in README
- [x] Improve install script with package manager detection and LSP installation
- [x] Fix shell script portability (replace echo -e with printf)
- [x] Fix checksum verification in install script for macOS/Linux compatibility

internal/parser/parser.go

@@ -11,6 +11,7 @@ import (
 	sitter "github.com/smacker/go-tree-sitter"
 	"github.com/smacker/go-tree-sitter/c"
 	"github.com/smacker/go-tree-sitter/cpp"
+	"github.com/smacker/go-tree-sitter/elixir"
 	"github.com/smacker/go-tree-sitter/golang"
 	"github.com/smacker/go-tree-sitter/html"
 	"github.com/smacker/go-tree-sitter/javascript"
@@ -88,10 +89,12 @@ func getLanguage(lang protocol.Language) (*sitter.Language, error) {
 	case protocol.LangVue:
 		// Vue SFC files use HTML-like template syntax, so we use the HTML parser
 		return html.GetLanguage(), nil
+	case protocol.LangElixir:
+		return elixir.GetLanguage(), nil
 	default:
 		return nil, errors.New(errors.ErrInvalidLanguage, fmt.Sprintf("language %s is not supported", lang)).
 			WithContext("language", string(lang)).
-			WithRemediation("Supported languages: Go, TypeScript, JavaScript, Python, C, C++, HTML, Vue")
+			WithRemediation("Supported languages: Go, TypeScript, JavaScript, Python, C, C++, HTML, Vue, Elixir")
 	}
 }