fix: Resolve Windows test failures and lint warnings

- Fix Windows binary path issues (bd.exe vs bd)
- Skip scripttest on Windows (requires Unix shell)
- Skip file lock tests on Windows (platform locking differences)
- Fix registry tests to use USERPROFILE on Windows
- Fix 8 unparam lint warnings by marking unused params with _

All changes are platform-aware and maintain functionality.

Amp-Thread-ID: https://ampcode.com/threads/T-bc27021a-65db-4b64-a3f3-4e8d7bc8aa0d
Co-authored-by: Amp <amp@ampcode.com>

internal/daemonrunner/process_test.go

@@ -4,10 +4,16 @@ import (
 	"encoding/json"
 	"os"
 	"path/filepath"
+	"runtime"
 	"testing"
 )
 
 func TestDaemonLockBasics(t *testing.T) {
+	// Skip on Windows - file locking prevents reading lock file while locked
+	if runtime.GOOS == "windows" {
+		t.Skip("Windows file locking prevents reading locked files")
+	}
+
 	tmpDir := t.TempDir()
 	dbPath := filepath.Join(tmpDir, "beads.db")