[remote_base] Cover transmit action names in the protocol source test and assert the rc_switch table layout

esphome/components/remote_base/rc_switch_protocol.h

@@ -68,7 +68,9 @@ class RCSwitchBase {
   uint32_t inverted_{};  // bool widened so every field is a word: the table is read from flash
 };
 
-// Constant-initialized and kept in flash on every platform
+// Constant-initialized and kept in flash on every platform; ESP8266 reads it in place, which only
+// works while every field is a whole word
+static_assert(sizeof(RCSwitchBase) == 7 * sizeof(uint32_t), "RCSwitchBase must stay word-only for flash reads");
 inline constexpr RCSwitchBase RC_SWITCH_PROTOCOLS[] PROGMEM = {
     {0, 0, 0, 0, 0, 0, false},
     {350, 10850, 350, 1050, 1050, 350, false},

tests/component_tests/remote_receiver/test_slot_counts.py

@@ -5,6 +5,7 @@ from pathlib import Path
 
 import pytest
 
+from esphome.automation import ACTION_REGISTRY
 from esphome.components import remote_base
 import esphome.config_validation as cv
 
@@ -59,7 +60,13 @@ def test_every_registry_name_maps_to_a_protocol_source() -> None:
         set(remote_base.BINARY_SENSOR_REGISTRY)
         | set(remote_base.DUMPER_REGISTRY)
         | {key.removeprefix("on_") for key in remote_base.TRIGGER_REGISTRY}
+        | {
+            key.removeprefix("remote_transmitter.transmit_")
+            for key in ACTION_REGISTRY
+            if key.startswith("remote_transmitter.transmit_")
+        }
     )
+    assert len(names) > 40
     for name in names:
         assert remote_base._protocol_stem(name) in remote_base._PROTOCOL_STEMS, name