R-717: after_setup open_command — the family window reopens an app's DB-held sign-up switch

The command form ran only when the lock was SET, so a database switch closed by
`command` stayed closed through the household's 15-minute window. New twin
fields `open_command` + `open_success` (same service/user/args_env and the same
argv-safe expansion and success-marker rules as `command`/`success`).

- liftNativeLock (the window, via OpenSignupWindow → goNativeLock(false)): marks
  the gate record native_lock "opening" BEFORE anything opens, lifts the env,
  runs open_command; only full success records "lifted". A failed open closes
  the switch again at once and records after_setup {ok: false, step: open}; the
  app page shows its own line (app_info.signup_native_open_failed).
- The close: reconcileSignupBlocks (every 20 s and at controller start) runs
  `command` for any non-"applied" state once no window runs. A failed close
  after a window is logged ERROR ("may still be OPEN past the household's
  window") and retried every nativeLockOpenRetry (2 min) instead of 30.
- After a successful app update, verifyAndConclude → markNativeLockForReapply
  sets native_lock "" so the loop closes the switch again.
- A template with `command` but no `open_command` keeps today's window (env
  only) and logs once per app that its own switch cannot be reopened.

Tests: internal/stacks/after_setup_r717_test.go (7), web render + parity case.

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_0159rPz1ZhFKsS53msqPYxtS

controller/internal/web/close_signup_test.go

@@ -21,6 +21,11 @@ func TestCloseSignupPage_TheCardAndItsPress(t *testing.T) {
 	if !strings.Contains(native, "újraindul") || !strings.Contains(native, `id="signup-native-failed"`) {
 		t.Fatal("the window's restart line or the failed-switch line is missing")
 	}
+	// R-717: a failed OPEN says so in its own words — never "could not be closed".
+	openFailed := renderAppInfoWith(t, map[string]interface{}{"SignupClosed": true, "SignupNativeOpenFailed": true})
+	if !strings.Contains(openFailed, `id="signup-native-open-failed"`) || !strings.Contains(openFailed, "megnyitni") || strings.Contains(openFailed, `id="signup-native-failed"`) {
+		t.Fatal("the failed-open line is missing, or the failed-close line shows instead")
+	}
 }
 
 // COMPANION RED-PROOF: skip the CloseSignupNow error mapping → the gated app answers 500, not 409.