Toolchain-suffixed idedata cache, surfaced idedata failures, and per-dump decode warnings

tests/unit_tests/components/esp8266/test_toolchain_validation.py

@@ -122,7 +122,7 @@ def test_decode_pc_native_missing_tools_warns_once(
     """A stack dump of many addresses produces one missing-tool warning."""
     from esphome.components import esp8266
 
-    esp8266._warn_missing_decode_tool.cache_clear()
+    esp8266._DECODE_WARNED_AT.clear()
     with (
         patch(
             "esphome.arduino8266.toolchain.get_addr2line_path",
@@ -136,4 +136,13 @@ def test_decode_pc_native_missing_tools_warns_once(
         esp8266._decode_pc({}, "40201234")
         esp8266._decode_pc({}, "40201238")
     assert caplog.text.count("Cannot decode crash addresses") == 1
-    esp8266._warn_missing_decode_tool.cache_clear()
+    esp8266._DECODE_WARNED_AT.clear()
+
+
+def test_resolve_toolchain_rejects_unsupported() -> None:
+    """ESP8266 rejects a CLI toolchain it cannot serve, like every platform."""
+    from esphome.components.esp8266 import _resolve_toolchain
+
+    CORE.toolchain = Toolchain.SDK_NRF
+    with pytest.raises(cv.Invalid, match="Unsupported toolchain 'sdk-nrf'"):
+        _resolve_toolchain({})

tests/unit_tests/test_arduino8266_toolchain.py

@@ -212,7 +212,7 @@ def test_get_idedata_delegates(tmp_path: Path) -> None:
     compile_commands, elf, cache = mock_load.call_args[0]
     assert compile_commands.name == "compile_commands.json"
     assert elf.name == "firmware.elf"
-    assert cache.name == "test8266.json"
+    assert cache.name == "test8266.arduino.json"
     # The exact configured launcher is passed for compile DB parsing
     assert mock_load.call_args.kwargs["launcher"] == str(Path("/cc/ccache"))