Reject unsupported CLI toolchains on every platform and complete the native CI triggers

tests/component_tests/esp32/test_esp32.py

@@ -131,6 +131,20 @@ def test_esp32_rejects_unsupported_toolchains(
         CONFIG_SCHEMA({"variant": VARIANT_ESP32, "toolchain": config_toolchain})
 
 
+def test_esp32_rejects_unsupported_cli_toolchain(
+    set_core_config: SetCoreConfigCallable,
+) -> None:
+    """A --toolchain the platform cannot serve fails instead of silently
+    building with PlatformIO (the CLI path bypasses the YAML validator)."""
+    set_core_config(PlatformFramework.ESP32_IDF)
+
+    from esphome.components.esp32 import CONFIG_SCHEMA
+
+    CORE.toolchain = Toolchain.ARDUINO
+    with pytest.raises(cv.Invalid, match="Unsupported toolchain 'arduino'"):
+        CONFIG_SCHEMA({"variant": VARIANT_ESP32})
+
+
 @pytest.mark.parametrize(
     ("config", "error_match"),
     [

tests/script/test_determine_jobs.py

@@ -3086,6 +3086,8 @@ def test_esp8266_native_components_full_list_on_infra_change() -> None:
         # Top-level esphome/*.py modules the backend imports directly
         ["esphome/framework_helpers.py"],
         ["esphome/writer.py"],
+        # ccache_path imports from platformio/toolchain.py
+        ["esphome/platformio/toolchain.py"],
     ):
         with (
             patch.object(determine_jobs, "changed_files", return_value=changed),

tests/unit_tests/test_nrf52_framework.py

@@ -531,3 +531,14 @@ def testget_tools_path_default_is_global_cache(
         Path(platformdirs.user_cache_dir("esphome", appauthor=False)) / "sdk-nrf"
     ).resolve()
     assert get_sdk_nrf_tools_path() == expected
+
+
+def test_resolve_toolchain_rejects_unsupported() -> None:
+    """A --toolchain nRF52 cannot serve fails instead of degrading silently."""
+    from esphome.components.nrf52 import _resolve_toolchain
+    import esphome.config_validation as cv
+    from esphome.const import Toolchain
+
+    CORE.toolchain = Toolchain.ARDUINO
+    with pytest.raises(cv.Invalid, match="Unsupported toolchain 'arduino'"):
+        _resolve_toolchain({})