Fix Windows: resolve agent command path before setting workdir

On Windows, exec.Command resolves executables relative to cmd.Dir
instead of searching PATH. Use exec.LookPath to get the absolute
path before creating the PTY command.

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

Author: hhfrancois

main.go

@@ -6,6 +6,7 @@ import (
 	"io"
 	"log"
 	"os"
+	"os/exec"
 	"os/signal"
 	"path/filepath"
 	"runtime"
@@ -281,11 +282,19 @@ func displayHeader(daemon *Daemon, session, command, workDir, agentVersion strin
 // startPTY starts the PTY and returns the pty master and command
 func startPTY(command, workDir string) (pty.Pty, *pty.Cmd) {
 	fmt.Printf("Starting %s...\n", command)
+
+	// Resolve full path before setting cmd.Dir, otherwise on Windows
+	// exec.Command resolves the command relative to cmd.Dir instead of PATH
+	commandPath, err := exec.LookPath(command)
+	if err != nil {
+		log.Fatalf("Failed to find '%s' in PATH: %v", command, err)
+	}
+
 	ptmx, err := pty.New()
 	if err != nil {
 		log.Fatal("Failed to create PTY:", err)
 	}
-	cmd := ptmx.Command(command)
+	cmd := ptmx.Command(commandPath)
 	cmd.Dir = workDir
 	cmd.Env = append(os.Environ(), "TERM=xterm-256color")