fix(cli): gate SIGWINCH resize watch behind unix build tag (#55)

syscall.SIGWINCH does not exist on Windows, breaking the release
cross-compile for windows/amd64.

Generated with [Devin](https://devin.ai)

Co-authored-by: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>

app/backend/internal/cli/commands/exec.go

@@ -4,9 +4,7 @@ import (
 	"fmt"
 	"net/http"
 	"os"
-	"os/signal"
 	"strings"
-	"syscall"
 	"time"
 
 	"github.com/gorilla/websocket"
@@ -44,20 +42,13 @@ var ShellCmd = &cobra.Command{
 			if err == nil {
 				defer term.Restore(fd, oldState)
 			}
-			if w, h, err := term.GetSize(fd); err == nil {
-				_ = conn.WriteJSON(map[string]interface{}{"type": "resize", "cols": w, "rows": h})
-			}
-			// Forward SIGWINCH resizes.
-			sigCh := make(chan os.Signal, 1)
-			signal.Notify(sigCh, syscall.SIGWINCH)
-			defer signal.Stop(sigCh)
-			go func() {
-				for range sigCh {
-					if w, h, err := term.GetSize(fd); err == nil {
-						_ = conn.WriteJSON(map[string]interface{}{"type": "resize", "cols": w, "rows": h})
-					}
+			sendSize := func() {
+				if w, h, err := term.GetSize(fd); err == nil {
+					_ = conn.WriteJSON(map[string]interface{}{"type": "resize", "cols": w, "rows": h})
 				}
-			}()
+			}
+			sendSize()
+			defer watchResize(sendSize)()
 		}
 
 		done := make(chan struct{})

app/backend/internal/cli/commands/exec_resize_unix.go

@@ -0,0 +1,30 @@
+//go:build !windows
+
+package commands
+
+import (
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+// watchResize forwards SIGWINCH events to send. Returns a stop func.
+func watchResize(send func()) func() {
+	sigCh := make(chan os.Signal, 1)
+	signal.Notify(sigCh, syscall.SIGWINCH)
+	done := make(chan struct{})
+	go func() {
+		for {
+			select {
+			case <-sigCh:
+				send()
+			case <-done:
+				return
+			}
+		}
+	}()
+	return func() {
+		signal.Stop(sigCh)
+		close(done)
+	}
+}

app/backend/internal/cli/commands/exec_resize_windows.go

@@ -0,0 +1,8 @@
+//go:build windows
+
+package commands
+
+// watchResize is a no-op on Windows — console resize events don't map to a
+// signal. The initial size is still sent, and Windows Terminal resize is rare
+// enough to accept stale dimensions for now.
+func watchResize(send func()) func() { return func() {} }