revert this after https://github.com/libretiny-eu/libretiny/pull/361

esphome/components/libretiny/__init__.py

@@ -33,9 +33,6 @@ from .const import (
     CONF_UART_PORT,
     FAMILIES,
     FAMILY_BK7231N,
-    FAMILY_BK7231Q,
-    FAMILY_BK7231T,
-    FAMILY_BK7251,
     FAMILY_COMPONENT,
     FAMILY_FRIENDLY,
     FAMILY_RTL8710B,
@@ -55,14 +52,20 @@ CODEOWNERS = ["@kuba2k2"]
 AUTO_LOAD = ["preferences"]
 IS_TARGET_PLATFORM = True
 
-# BK72XX SDK options to disable unused features.
+# BK7231N SDK options to disable unused features.
 # Disabling BLE saves ~21KB RAM and ~200KB Flash because BLE init code is
 # called unconditionally by the SDK. ESPHome doesn't use BLE on LibreTiny.
 #
+# This only works on BK7231N (BLE 5.x). Other BK72XX chips using BLE 4.2
+# (BK7231T, BK7231Q, BK7251) cannot disable BLE via custom_options because
+# the LibreTiny builder reads CFG_SUPPORT_BLE from the sys_config file at
+# build-script time to decide which sources to compile - the custom_options
+# override only affects C preprocessor defines, not the builder's Python logic.
+#
 # Other options like CFG_TX_EVM_TEST, CFG_RX_SENSITIVITY_TEST, CFG_SUPPORT_BKREG,
 # CFG_SUPPORT_OTA_HTTP, and CFG_USE_SPI_SLAVE were evaluated but provide no  # NOLINT
 # measurable benefit - the linker already strips unreferenced code via -gc-sections.
-_BK72XX_SYS_CONFIG_OPTIONS = [
+_BK7231N_SYS_CONFIG_OPTIONS = [
     "CFG_SUPPORT_BLE=0",
 ]
 
@@ -383,14 +386,9 @@ async def component_to_code(config):
         cg.add_platformio_option("custom_fw_version", __version__)
 
     # Apply chip-specific SDK options to save RAM/Flash
-    if config[CONF_FAMILY] in (
-        FAMILY_BK7231N,
-        FAMILY_BK7231Q,
-        FAMILY_BK7231T,
-        FAMILY_BK7251,
-    ):
+    if config[CONF_FAMILY] == FAMILY_BK7231N:
         cg.add_platformio_option(
-            "custom_options.sys_config#h", _BK72XX_SYS_CONFIG_OPTIONS
+            "custom_options.sys_config#h", _BK7231N_SYS_CONFIG_OPTIONS
         )
 
     # Disable LWIP statistics to save RAM - not needed in production