Apply mechanical lint fixes for golangci-lint v2.12.2 rollout

Auto-remediate style-only findings (wsl_v5, nlreturn, noinlineerr,
modernize, intrange, perfsprint, usetesting, unconvert, errorlint,
gocritic, testifylint) and rename printf-style helpers to f-suffixed
names (goprintffuncname): ui.Writer message methods, cli.ReportErrorf,
database.Fatalf, vaultik stdoutf.

internal/pidlock/pidlock.go

@@ -77,6 +77,7 @@ func (l *Lock) Release() error {
 	}
 
 	l.path = "" // Prevent double-release
+
 	return nil
 }
 
@@ -104,5 +105,6 @@ func isProcessRunning(pid int) bool {
 
 	// On Unix, FindProcess always succeeds. We need to send signal 0 to check.
 	err = process.Signal(syscall.Signal(0))
+
 	return err == nil
 }

internal/pidlock/pidlock_test.go

@@ -40,6 +40,7 @@ func TestAcquireBlocksSecondInstance(t *testing.T) {
 	// Acquire first lock
 	lock1, err := Acquire(tmpDir)
 	require.NoError(t, err)
+
 	require.NotNil(t, lock1)
 	defer func() { _ = lock1.Release() }()
 
@@ -61,6 +62,7 @@ func TestAcquireWithStaleLock(t *testing.T) {
 	// Should be able to acquire lock (stale lock is cleaned up)
 	lock, err := Acquire(tmpDir)
 	require.NoError(t, err)
+
 	require.NotNil(t, lock)
 	defer func() { _ = lock.Release() }()
 
@@ -88,6 +90,7 @@ func TestReleaseIsIdempotent(t *testing.T) {
 
 func TestReleaseNilLock(t *testing.T) {
 	var lock *Lock
+
 	err := lock.Release()
 	assert.NoError(t, err)
 }
@@ -98,6 +101,7 @@ func TestAcquireCreatesDirectory(t *testing.T) {
 
 	lock, err := Acquire(nestedDir)
 	require.NoError(t, err)
+
 	require.NotNil(t, lock)
 	defer func() { _ = lock.Release() }()