Add UART SET_LOG_LEVEL for runtime master ESP-IDF logging.

Expose the command via goTool CLI/REST and dashboard controls so log verbosity can be tuned without reflashing.

Co-authored-by: Cursor <cursoragent@cursor.com>

main/README.md

@@ -228,6 +228,8 @@ Host and master speak nanopb-encoded `UartMessage` inside UART frames (byte 0 =
 | 25 | `ACCEL_STREAM` | Implemented — enable/disable slave ESP-NOW accel stream to master |
 | 27 | `TAP_NOTIFY` | Implemented (`cmd/cmd_tap_notify.c`) — get/set which tap kinds notify via ESP-NOW |
 | 29 | `CACHE_STATUS` | Implemented (`cmd/cmd_cache_status.c`) — subscribed accel + tap cache (one UART round-trip) |
+| 30 | `ESPNOW_ECHO_PING` | Implemented (`cmd/cmd_espnow_echo_ping.c`) — ESP-NOW timestamp echo (latency test) |
+| 31 | `SET_LOG_LEVEL` | Implemented (`cmd/cmd_set_log_level.c`) — get/set global `esp_log_level_set("*", …)` on master |
 
 Regenerate C code:
 
@@ -390,6 +392,30 @@ go run . -port /dev/ttyUSB0 find-me
 go run . -port /dev/ttyUSB0 find-me -client 16
 ```
 
+### SET_LOG_LEVEL command
+
+Read or set the **global** ESP-IDF log filter on the master (`esp_log_level_set("*", level)`). Does not affect the host UART protocol (UART1); `esp_log_*` output goes to the **debug console UART0** (USB, 115200).
+
+**Request:** framed `31` (`0x1f`) + `set_log_level_request` (`write`, `level` 0–5).
+
+**Response:** `set_log_level_response` (`success`, `level`).
+
+| `level` | `esp_log_level_t` |
+|---------|-------------------|
+| 0 | NONE |
+| 1 | ERROR |
+| 2 | WARN |
+| 3 | INFO |
+| 4 | DEBUG |
+| 5 | VERBOSE |
+
+Boot default follows `CONFIG_LOG_DEFAULT_LEVEL` in `sdkconfig` (not persisted across reboot).
+
+```bash
+go run . -port /dev/ttyUSB0 log-level
+go run . -port /dev/ttyUSB0 log-level -set -level 0
+```
+
 ### RESTART command
 
 Reboot the master (`client_id=0`) or one slave via ESP-NOW (`client_id` = registry id). The device sends the UART response, then restarts after ~150 ms.
@@ -541,6 +567,7 @@ Target: ESP32-S3. Close serial monitor on the UART adapter port before running `
 | `pod_settings.c/h` | NVS persistence (accel deadzone, …) |
 | `led_ring.c/h` | LED ring (digit display, progress bar) |
 | `cmd/cmd_led_ring.c` | UART `LED_RING` progress command |
+| `cmd/cmd_set_log_level.c` | UART `SET_LOG_LEVEL` — runtime ESP-IDF log level |
 | `proto/uart_messages.proto` | UART protocol schema |
 | `proto/esp_now_messages.proto` | ESP-NOW protocol schema |
 | `esp_now_proto.c/h` | Encode/decode `EspNowMessage` |