Both compile the same portable core (src/meshcore_companion.c) and differ only
in the UART transport:
- examples-esp-idf/tty_bridge: full ESP-IDF project (UART driver), core
compiled directly via the component CMakeLists (no copy)
- examples-stm32/uart_bridge: HAL drop-in (meshcore_setup/meshcore_poll) for a
CubeMX/CubeIDE project, with integration README
README updated: new examples in layout + an 'Other platform examples' section.
Verified host build/test still pass and both new examples pass -Wall -Wextra
syntax checks against stubbed platform headers.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>