Tab5 power expander driver and devicetree parsing improvements (#507)

* **New Features**
  * PI4IOE5V6408 I2C I/O expander driver with public GPIO APIs
  * CLI tool to list devicetree dependencies

* **Device Tree Updates**
  * M5Stack Tab5 configured with two I2C IO expanders; PI4IOE5V6408 binding added

* **Build / Tooling**
  * Devicetree code generation integrated into build; generated artifacts and dynamic dependency resolution exposed

* **Refactor**
  * Kernel/run APIs updated to accept a null‑terminated devicetree modules array; many module symbols renamed

* **Documentation**
  * Added README and Apache‑2.0 license for new driver module

Tactility/Include/Tactility/Tactility.h

@@ -23,11 +23,10 @@ struct Configuration {
 
 /**
  * @brief Main entry point for Tactility.
- * @param platformModule Platform module to start (non-null).
- * @param deviceModule Device module to start (non-null).
+ * @param dtsModules List of modules from devicetree, null-terminated, non-null parameter
  * @param dtsDevices Array that is terminated with DTS_DEVICE_TERMINATOR
  */
-void run(const Configuration& config, Module* platformModule, Module* deviceModule, struct DtsDevice dtsDevices[]);
+void run(const Configuration& config, Module* dtsModules[], DtsDevice dtsDevices[]);
 
 /**
  * While technically nullable, this instance is always set if tt_init() succeeds.