hooks: skip non-existent CWD for remote sessions

If the session CWD does not exist locally (remote execution), do not
set cmd.Dir. This prevents fork/exec failures when the CWD only
exists on the remote host.

pkg/agent/hooks.go

@@ -6,6 +6,7 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
+	"os"
 	"os/exec"
 	"strings"
 	"syscall"
@@ -132,7 +133,12 @@ func runHookCmd(ctx context.Context, name, cmdStr string, payloadJSON []byte, cw
 	cmd.SysProcAttr = &syscall.SysProcAttr{Setpgid: true}
 	cmd.Stdin = bytes.NewReader(payloadJSON)
 	if cwd != "" {
-		cmd.Dir = paths.ExpandHome(cwd)
+		expanded := paths.ExpandHome(cwd)
+		// Only set Dir if the path exists locally (remote sessions
+		// have a CWD that only exists on the remote host).
+		if _, err := os.Stat(expanded); err == nil {
+			cmd.Dir = expanded
+		}
 	}
 
 	// Inject payload map keys as OLLIE_* environment variables so hook