Add sync and gitignore tests, fix loadGitignore bug

- Added gitignore_test.go: comprehensive tests for go-gitignore patterns
  - Verified: *, **, [], negation, anchored patterns, comments
  - Documented limitation: ? wildcard not supported by go-gitignore
- Added sync_test.go: integration tests for initial sync
  - Tests: basic files, gitignore excludes, negation, double-star,
    directory patterns, symlinks, permissions, dry-run, .git skip,
    nested gitignore, complex combined patterns
- Fixed gitignore.go: use CompileIgnoreFile instead of passing
  entire file content as single string to CompileIgnoreLines

1 files changed, 3 insertions, 7 deletions

diff --git a/gitignore.go b/gitignore.go
index f6816bd..80d14a6 100644
--- a/gitignore.go
+++ b/gitignore.go
@@ -10,13 +10,9 @@ import (
 func loadGitignore(hostDir string) (*ignore.GitIgnore, error) {
 	gitignorePath := filepath.Join(hostDir, ".gitignore")
 
-	data, err := os.ReadFile(gitignorePath)
-	if err != nil {
-		if os.IsNotExist(err) {
-			return ignore.CompileIgnoreLines(), nil
-		}
-		return nil, err
+	if _, err := os.Stat(gitignorePath); os.IsNotExist(err) {
+		return ignore.CompileIgnoreLines(), nil
 	}
 
-	return ignore.CompileIgnoreLines(string(data)), nil
+	return ignore.CompileIgnoreFile(gitignorePath)
 }