Fix Windows: use cmd.exe /c for tmux command chain

psmux on Windows doesn't handle ; separators when args are passed
individually via exec.Command. On Windows, build the full tmux
command string and run it through cmd.exe /c instead.

cmd/kctl-tui/full.go

@@ -7,6 +7,7 @@ import (
 	"fmt"
 	"os"
 	"os/exec"
+	"runtime"
 	"sort"
 
 	tea "github.com/charmbracelet/bubbletea"
@@ -286,6 +287,25 @@ func (m *fullModel) startTmuxSession() tea.Cmd {
 	fmt.Fprintf(os.Stderr, "[debug] panelCmd=%s\n", panelCmd)
 	fmt.Fprintf(os.Stderr, "[debug] kill-session err=%v\n", killErr)
 
+	var c *exec.Cmd
+	if runtime.GOOS == "windows" {
+		// On Windows, psmux doesn't handle ; separators when args are
+		// passed individually via exec.Command. Build the full command
+		// string and run it through cmd.exe.
+		tmuxScript := fmt.Sprintf(
+			"tmux new-session -d -s kctl %q ; set-option -t kctl remain-on-exit on ; split-window -v -t kctl:0.0 %q",
+			panelCmd, k9sCmdA,
+		)
+		if len(m.cfg.Envs) > 1 {
+			envB := m.cfg.Envs[1]
+			ctxB := m.cfg.ResolveContext(envB, m.selectedContext)
+			k9sCmdB := fmt.Sprintf("k9s --context %s -n %s", ctxB, m.selectedNamespace)
+			tmuxScript += fmt.Sprintf(" ; split-window -v -t kctl:0.1 %q", k9sCmdB)
+		}
+		tmuxScript += " ; select-layout -t kctl even-vertical ; select-pane -t kctl:0.0 ; attach -t kctl"
+		fmt.Fprintf(os.Stderr, "[debug] windows cmd: %s\n", tmuxScript)
+		c = exec.Command("cmd.exe", "/c", tmuxScript)
+	} else {
 		args := []string{
 			"new-session", "-d", "-s", "kctl",
 			panelCmd, ";",
@@ -305,9 +325,9 @@ func (m *fullModel) startTmuxSession() tea.Cmd {
 			"select-pane", "-t", "kctl:0.0", ";",
 			"attach", "-t", "kctl",
 		)
-
+		fmt.Fprintf(os.Stderr, "[debug] unix args: %v\n", args)
-	fmt.Fprintf(os.Stderr, "[debug] tmux args: %v\n", args)
+		c = exec.Command("tmux", args...)
-	c := exec.Command("tmux", args...)
+	}
 
 	return tea.ExecProcess(c, func(err error) tea.Msg {
 		return tmuxDoneMsg{err: err}