docs(readme): mark esp32-c6-devkitc-multi-midi2 as WIP

ESP32_Host_MIDI v6.0.0 / v6.0.1 carries BLE GATT visibility regressions
that still need iteration before the recipe is shippable. Replace the
✅ Device tick and the "Hardware validated 2026-05-01" claim with a
work-in-progress badge so the README does not over-promise. The
recipe stays in examples/, the build system bucket and the by-role
totals are unchanged -- only the readiness signal moved.

Author: sauloverissimo

README.md

@@ -169,7 +169,7 @@ Validated on real hardware against forks and PRs maintained internally while the
 | **Waveshare RP2350-USB-A** | RP2350 | ✅ | ✅ | ✅ | ![override](https://img.shields.io/badge/-override-blueviolet.svg) TinyUSB, PIO-USB on GP12/GP13 | TinyUSB PR #3571 + Pico-PIO-USB `675543b` + R13 hardware mod for host mode (desolder the 1.5 kΩ pull-up on USB-A D+), recipes in [`waveshare-rp2350-usb-a-midi2`](examples/waveshare-rp2350-usb-a-midi2) (device) and [`waveshare-rp2350-usb-a-bridge-midi2`](examples/waveshare-rp2350-usb-a-bridge-midi2) (bridge) |
 | **SparkFun Pro Micro RP2350** | RP2350 | ✅ | - | - | ![override](https://img.shields.io/badge/-override-blueviolet.svg) TinyUSB | TinyUSB PR #3571, recipe in [`sparkfun-promicro-rp2350-midi2`](examples/sparkfun-promicro-rp2350-midi2) |
 | Raspberry Pi Pico 2 | RP2350 | ✅ | ✅ | - | - | TinyUSB PR #3571 |
-| **ESP32-C6-DevKitC-1** | ESP32-C6 | ✅ | - | - | BLE-MIDI 1.0 + ESP-NOW | ESP32_Host_MIDI v6.0.0 (no USB-OTG on this chip), recipe in [`esp32-c6-devkitc-multi-midi2`](examples/esp32-c6-devkitc-multi-midi2) (Tier B wireless, no PID consumed). Hardware validated 2026-05-01: BLE advertised name `Esp32C6Multi` on the standard Apple service UUID, ESP-NOW broadcast on WiFi channel 1, MAC `98:A3:16:AA:7D:20`, C major showcase loop emitting on both transports |
+| **ESP32-C6-DevKitC-1** | ESP32-C6 | ![WIP](https://img.shields.io/badge/-WIP-orange.svg) | - | - | BLE-MIDI 1.0 + ESP-NOW | ![WIP](https://img.shields.io/badge/-work_in_progress-orange.svg) ESP32_Host_MIDI v6.0.x (BLE GATT visibility regressions still being iterated; the chip has no USB-OTG so the wireless transports are the only path here). Recipe in [`esp32-c6-devkitc-multi-midi2`](examples/esp32-c6-devkitc-multi-midi2) (Tier B wireless, no PID consumed). |
 | **nRF52840 Pro Micro (Nice!Nano class)** | nRF52840 | ✅ | - | - | ![override](https://img.shields.io/badge/-override-blueviolet.svg) TinyUSB | TinyUSB native CMake build (PR #3571 fork via FetchContent + `hw/bsp/family_support.cmake`, BSP `feather_nrf52840_express` upstream), recipe in [`nrf52840-promicro-midi2`](examples/nrf52840-promicro-midi2) (Tier B). Hardware validated 2026-04-30 on Nice!Nano: enumerates `cafe:40F1`, `Group 1 (Main)` visible to ALSA, Per-Note PB vibrato + chromatic walk + RPN/NRPN streaming live |
 | **Seeed XIAO SAMD21** | SAMD21 | ✅ | - | - | ![override](https://img.shields.io/badge/-override-blueviolet.svg) TinyUSB | TinyUSB native CMake build (PR #3571 fork via FetchContent + `hw/bsp/family_support.cmake`, BSP `seeeduino_xiao` upstream), recipe in [`xiao-samd21-midi2`](examples/xiao-samd21-midi2) (Tier C). Hardware validated 2026-04-30: enumerates `cafe:40F0`, `Group 1 (Main)` visible to ALSA, chromatic walk + CC sweep streaming live |
 | T-PicoC3 | RP2040 + ESP32-C3 | ✅ | - | - | - | TinyUSB PR #3571 |