fix(esp32-ui): add bootable scaffold and align docs

firmware/zeroclaw-esp32-ui/src/main.rs

@@ -0,0 +1,22 @@
+//! ZeroClaw ESP32 UI firmware scaffold.
+//!
+//! This binary initializes ESP-IDF, boots a minimal Slint UI, and keeps
+//! architecture boundaries explicit so hardware integrations can be added
+//! incrementally.
+
+use anyhow::Context;
+use log::info;
+
+slint::include_modules!();
+
+fn main() -> anyhow::Result<()> {
+    esp_idf_svc::sys::link_patches();
+    esp_idf_svc::log::EspLogger::initialize_default();
+
+    info!("Starting ZeroClaw ESP32 UI scaffold");
+
+    let window = MainWindow::new().context("failed to create MainWindow")?;
+    window.run().context("MainWindow event loop failed")?;
+
+    Ok(())
+}