Add log level system and sync logging

- log.go: log level system (DEBUG, INFO, WARN, ERROR, NONE)
- CLI: -log-level flag (default info), -verbose as shorthand for debug
- Watcher: logs sync/remove actions at INFO level
- Watcher: logs events at DEBUG level
- Errors: structured error messages (DISK FULL, PERMISSION DENIED, etc.)
- Updated README with -log-level flag

1 files changed, 4 insertions, 4 deletions

diff --git a/errors_test.go b/errors_test.go
index 553939d..e35e5b3 100644
--- a/errors_test.go
+++ b/errors_test.go
@@ -101,19 +101,19 @@ func TestIsRetryable(t *testing.T) {
 }
 
 func TestLogError_DiskFull(t *testing.T) {
-	logError("copy", "test.txt", syscall.ENOSPC)
+	logSyncError("copy", "test.txt", syscall.ENOSPC)
 }
 
 func TestLogError_PermissionDenied(t *testing.T) {
-	logError("write", "test.txt", syscall.EACCES)
+	logSyncError("write", "test.txt", syscall.EACCES)
 }
 
 func TestLogError_NotExist(t *testing.T) {
-	logError("stat", "test.txt", fs.ErrNotExist)
+	logSyncError("stat", "test.txt", fs.ErrNotExist)
 }
 
 func TestLogError_Nil(t *testing.T) {
-	logError("test", "file.txt", nil)
+	logSyncError("test", "file.txt", nil)
 }
 
 func TestSyncError(t *testing.T) {