Fix integration test compilation errors in cmd/bd

The integration tests were failing to compile due to several issues
introduced by API changes that weren't reflected in the test files:

1. daemon_test.go:
   - getPIDFilePath() signature changed: removed boolean parameter
   - getLogFilePath() signature changed: removed boolean parameter
   - Removed duplicate windowsOS constant (already in test_helpers_test.go)

2. daemon_parent_test.go:
   - Removed duplicate runGitCmd() function (already in git_sync_test.go
     with more functionality including date env vars)
   - Removed unused os/exec import

These fixes allow `go test -tags integration ./cmd/bd` to compile
successfully. The test suite can now be run to verify daemon and
sync branch functionality.

No behavioral changes - only fixing test compilation issues.

cmd/bd/daemon_parent_test.go

@@ -4,7 +4,6 @@
 package main
 
 import (
-	"os/exec"
 	"path/filepath"
 	"testing"
 )
@@ -39,10 +38,4 @@ func mustAbs(t *testing.T, path string) string {
 	return abs
 }
 
-func runGitCmd(t *testing.T, dir string, args ...string) {
+// runGitCmd is defined in git_sync_test.go
-	cmd := exec.Command("git", args...)
-	cmd.Dir = dir
-	if err := cmd.Run(); err != nil {
-		t.Fatalf("git %v failed: %v", args, err)
-	}
-}

cmd/bd/daemon_test.go

@@ -23,7 +23,7 @@ import (
 	"github.com/steveyegge/beads/internal/types"
 )
 
-const windowsOS = "windows"
+// windowsOS constant moved to test_helpers_test.go
 
 func initTestGitRepo(t testing.TB, dir string) {
 	t.Helper()
@@ -70,7 +70,7 @@ func TestGetPIDFilePath(t *testing.T) {
 	defer func() { dbPath = oldDBPath }()
 
 	dbPath = filepath.Join(tmpDir, ".beads", "test.db")
-	pidFile, err := getPIDFilePath(false) // test local daemon
+	pidFile, err := getPIDFilePath()
 	if err != nil {
 		t.Fatalf("getPIDFilePath failed: %v", err)
 	}
@@ -118,7 +118,7 @@ func TestGetLogFilePath(t *testing.T) {
 			defer func() { dbPath = oldDBPath }()
 			dbPath = dbFile
 
-			result, err := getLogFilePath(userPath, false) // test local daemon
+			result, err := getLogFilePath(userPath)
 			if err != nil {
 				t.Fatalf("getLogFilePath failed: %v", err)
 			}