TactilityKernel improvements (#464)

* **New Features**
  * Thread API with lifecycle, priority, affinity and state monitoring
  * Timer subsystem: one-shot/periodic timers, reset, pending callbacks, expiry queries
  * Expanded I²C: register-level ops, bulk writes, presence checks, ESP32 integration and new config properties
  * GPIO controller: pin level and options APIs
  * Error utilities: new error code, error-to-string, timeout helper and common macros
  * Device construction helpers (construct+start)

* **Tests**
  * New unit tests for thread and timer behavior

* **Documentation**
  * Expanded coding style guide (files/folders, C conventions)

TactilityKernel/CMakeLists.txt

@@ -7,6 +7,8 @@ if (DEFINED ENV{ESP_IDF_VERSION})
     idf_component_register(
         SRCS ${SOURCES}
         INCLUDE_DIRS "Include/"
+        # TODO move the related logic for esp_time in Tactility/time.h into the Platform/ subproject
+        REQUIRES esp_timer
     )
 
 else ()