P7.1: move Windows-only runner tests into runner_windows_test.go

Tests touching SysProcAttr.HideWindow/CmdLine and windowsShellCommandLine
are guarded by //go:build windows; runner_test.go drops the winproc import.
Linux cross-compile and Windows test run both clean.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/runner/runner_windows_test.go

@@ -0,0 +1,53 @@
+//go:build windows
+
+package runner
+
+import (
+	"context"
+	"testing"
+
+	"gitea.mixdep.ru/mix/gosentry/src/domain"
+	"gitea.mixdep.ru/mix/gosentry/src/platform/winproc"
+)
+
+func TestDirectCommandDoesNotHideWindow(t *testing.T) {
+	invocation := jobInvocation(context.Background(), domain.Job{
+		Command:   `C:\Windows\System32\cmd.exe`,
+		Arguments: "/C\necho visible direct process",
+	})
+	if invocation.hideWindow {
+		t.Fatal("direct command should not request hidden startup window")
+	}
+}
+
+func TestShellCommandHidesWindow(t *testing.T) {
+	invocation := jobInvocation(context.Background(), domain.Job{Command: "echo hidden shell process"})
+	if !invocation.hideWindow {
+		t.Fatal("shell command should request hidden startup window")
+	}
+	winproc.ConfigureHiddenWindow(invocation.command)
+	if invocation.command.SysProcAttr == nil || !invocation.command.SysProcAttr.HideWindow {
+		t.Fatal("expected shell command to be hidden")
+	}
+}
+
+func TestShellCommandUsesWindowsSafeQuoting(t *testing.T) {
+	command := shellCommand(context.Background(), `"C:\Program Files\FreeFileSync\FreeFileSync.exe" "D:\Local\Programs\FreeFileSync\Jobs\Auto.ffs_batch"`)
+	winproc.ConfigureHiddenWindow(command)
+
+	want := `cmd.exe /S /C ""C:\Program Files\FreeFileSync\FreeFileSync.exe" "D:\Local\Programs\FreeFileSync\Jobs\Auto.ffs_batch""`
+	if command.SysProcAttr == nil {
+		t.Fatal("expected SysProcAttr")
+	}
+	if command.SysProcAttr.CmdLine != want {
+		t.Fatalf("expected command line %q, got %q", want, command.SysProcAttr.CmdLine)
+	}
+}
+
+func TestWindowsShellCommandLineQuotesUnquotedProgramPath(t *testing.T) {
+	got := windowsShellCommandLine(`C:\Program Files\Joplin\Joplin.exe --profile "D:\Joplin Profile"`)
+	want := `cmd.exe /S /C ""C:\Program Files\Joplin\Joplin.exe" --profile "D:\Joplin Profile""`
+	if got != want {
+		t.Fatalf("expected command line %q, got %q", want, got)
+	}
+}