Drop the never-hitting parse memo, guard the post-compile idedata refresh, pin the kind map

tests/unit_tests/test_platformio_library.py

@@ -564,3 +564,15 @@ def test_split_flag_entry_non_string_is_clean() -> None:
         split_flag_entry({"esp32": ["-DX"]}, "lib x")
     with pytest.raises(EsphomeError, match="Malformed build flag 5"):
         split_flag_entry(5, "lib x")
+
+
+def test_source_kind_map_shape() -> None:
+    """The kind values the native compile rules key on, and the deliberate
+    AS/ASPP merge (.s and .S both map to asm)."""
+    from esphome.platformio.library import SOURCE_KIND_FOR_SUFFIX
+
+    assert set(SOURCE_KIND_FOR_SUFFIX.values()) == {"c", "cxx", "asm"}
+    assert SOURCE_KIND_FOR_SUFFIX[".s"] == "asm"
+    assert SOURCE_KIND_FOR_SUFFIX[".S"] == "asm"
+    assert SOURCE_KIND_FOR_SUFFIX[".c"] == "c"
+    assert SOURCE_KIND_FOR_SUFFIX[".cpp"] == "cxx"