perf: claude_optimization (rawsyscalln) in swift parser

Produced by Dyno run go_20260410_0345409355e7e, iteration 2.

Dyno-Run: go_20260410_0345409355e7e
Dyno-Iteration: 2
Dyno-Campaign: dart-parser-optimization
Dyno-Project: clarity-cli
Dyno-Worktree-SHA: 4819536e29bc20a42997cd040380efb9827ecec0
Dyno-Baseline-Wall-Ms: 2139
Dyno-Candidate-Wall-Ms: 1632
Dyno-Correctness: passed
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: ragunathjawahar

depgraph/languages/swift/parser_swift.go

@@ -5,11 +5,23 @@ import (
 	"fmt"
 	"os"
 	"strings"
+	"sync"
 
 	sitter "github.com/smacker/go-tree-sitter"
 	"github.com/smacker/go-tree-sitter/swift"
 )
 
+var (
+	swiftLanguage   = swift.GetLanguage()
+	swiftParserPool = sync.Pool{
+		New: func() any {
+			parser := sitter.NewParser()
+			parser.SetLanguage(swiftLanguage)
+			return parser
+		},
+	}
+)
+
 // SwiftImport represents an import in a Swift file.
 type SwiftImport struct {
 	Path string
@@ -148,9 +160,14 @@ func ExtractSwiftTypeIdentifiers(sourceCode []byte) []string {
 }
 
 func parseSwift(sourceCode []byte) (*sitter.Tree, error) {
-	parser := sitter.NewParser()
-	parser.SetLanguage(swift.GetLanguage())
-	return parser.ParseCtx(context.Background(), nil, sourceCode)
+	parser, _ := swiftParserPool.Get().(*sitter.Parser)
+	if parser == nil {
+		parser = sitter.NewParser()
+		parser.SetLanguage(swiftLanguage)
+	}
+	tree, err := parser.ParseCtx(context.Background(), nil, sourceCode)
+	swiftParserPool.Put(parser)
+	return tree, err
 }
 
 func isTopLevelSwiftDeclaration(node *sitter.Node) bool {