feat(ble): expose isInitialized and reclaim memory before radios start

The controller and the WiFi driver each need a large aggregate allocation,
which a live app sitting on garbage can deny - that is why a failed connect
often succeeded on retry. Both bindings now collect before initializing, and
the tree reserves its node and spec capacity so a build does not reallocate
into a tight heap.

native/src/bindings/core/ble.cpp

@@ -13,6 +13,9 @@ namespace {
 int init(lua_State* state) {
   std::string name;
   const bool hasName = optionalString(state, 1, name);
+  // The controller needs a large aggregate allocation; reclaim app garbage
+  // first so a live screen's churn does not fail the init.
+  lua_gc(state, LUA_GCCOLLECT, 0);
   return pushStatus(
       state, Runtime::from(state)->ble().init(hasName ? &name : nullptr));
 }
@@ -22,6 +25,11 @@ int deinit(lua_State* state) {
   return 0;
 }
 
+int isInitialized(lua_State* state) {
+  lua_pushboolean(state, Runtime::from(state)->ble().isInitialized());
+  return 1;
+}
+
 int scan(lua_State* state) {
   const int32_t durationMs = optionalInt(state, 1, 3000);
   luaL_argcheck(state, durationMs > 0, 1, "must be positive");
@@ -97,6 +105,9 @@ const luaL_Reg FUNCTIONS[] = {
     {"init", init},
     // --- Stops the BLE stack and releases its memory.
     {"deinit", deinit},
+    // --- Whether the BLE stack is running.
+    // @return boolean
+    {"isInitialized", isInitialized},
     // --- Scans for advertising devices.
     // @param durationMs integer|nil Defaults to 3000.
     // @return BleDevice[]|nil devices

native/src/bindings/core/wifi.cpp

@@ -41,6 +41,9 @@ int connect(lua_State* state) {
   std::string password;
   const bool hasSsid = optionalString(state, 1, ssid);
   const bool hasPassword = optionalString(state, 2, password);
+  // The driver needs ~28KB in aggregate and a live app can be sitting on that
+  // much garbage, which is why a failed connect often succeeds on retry.
+  lua_gc(state, LUA_GCCOLLECT, 0);
   const Status status = Runtime::from(state)->wifi().connect(
       hasSsid ? &ssid : nullptr, hasPassword ? &password : nullptr);
   return pushStatus(state, status);