Fork fix: the SDIO wedge is FIXED (esp-hosted-mcu #167)

Root cause (verified against our exact IDF tree, not the community guess):
the "258" in "sdio_write_task: Failed to send data: 258" is NOT a timeout
(that is 263). 258 = 0x102 = ESP_ERR_INVALID_ARG. On the ESP32-P4, block-
mode CMD53 writes require the SOURCE buffer to be 64-byte (cache-line)
aligned; the IDF sdmmc driver rejects a misaligned source with INVALID_ARG
BEFORE any bus activity. esp_hosts write loop then declares "Unrecoverable
host sdio state" and reboots the whole P4. The audio TX payload is not
64-aligned, so streaming mic audio wedged on the very FIRST frame (which is
exactly what we saw: listening -> instant Failed to send -> reboot).

This also explains why buffer/queue/clock/retry tuning all did nothing: the
write never reached the bus. And why our symptom was instant, not after
~100 writes (the community block-mode-desync theory) — it is the first
misaligned buffer, every time.

Fix: vendored esp_hosted 2.12.11 as an editable local component (overrides
the registry copy) and bounce a misaligned TX payload through one aligned
DMA scratch buffer in hosted_sdio_write_block (port_esp_hosted_host_sdio.c).
TX is serialized by the bus lock so a single static bounce buffer is safe;
freed in hosted_sdio_deinit. Host-only change — no C6 reflash.

VERIFIED ON HARDWARE (autonomous self-test): 40s of continuous mic-audio
upstream streaming — the traffic that previously wedged on the first frame
— ran clean, zero timeouts, zero reboots. A guarded SDIO_TX_SELFTEST harness
is kept (compiled out) for future SDIO stress testing.

Credit: root cause + patch designed via multi-agent investigation; the
precise 258=INVALID_ARG decode (correcting the upstream community timeout
assumption) came from checking our actual esp_err.h.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

firmware/main/desklock_main.c

@@ -85,6 +85,35 @@ void app_on_playback_done(void)
     face_set(FACE_IDLE);
 }
 
+#if SDIO_TX_SELFTEST
+/* Temporary autonomous SDIO-TX stress test: stream mic audio upstream for 40s
+ * right after connecting (no user tap needed) to prove the #167 alignment fix.
+ * Remove once verified. */
+static void sdio_tx_selftest_task(void *arg)
+{
+    (void)arg;
+    vTaskDelay(pdMS_TO_TICKS(4000));
+    ESP_LOGW("selftest", "SDIO TX STRESS START: streaming mic audio 40s");
+    audio_capture_start();
+    for (int i = 0; i < 40; i++) {
+        vTaskDelay(pdMS_TO_TICKS(1000));
+        ESP_LOGW("selftest", "SDIO TX STRESS: alive %ds (no wedge)", i + 1);
+    }
+    audio_capture_stop();
+    ESP_LOGW("selftest", "SDIO TX STRESS SURVIVED 40s — #167 FIX CONFIRMED");
+    vTaskDelete(NULL);
+}
+
+void sdio_tx_selftest_kick(void)
+{
+    static bool started;
+    if (!started) {
+        started = true;
+        xTaskCreate(sdio_tx_selftest_task, "sdiotest", 4096, NULL, 4, NULL);
+    }
+}
+#endif
+
 void app_main(void)
 {
     ESP_LOGI(TAG, "DeskLock starting");

firmware/main/gw_client.c

@@ -71,6 +71,10 @@ static void ws_event(void *arg, esp_event_base_t base, int32_t id, void *data)
                  esp_app_get_description()->version);
         gw_send_text(hello);
         face_set(FACE_IDLE);
+#if SDIO_TX_SELFTEST
+        extern void sdio_tx_selftest_kick(void);
+        sdio_tx_selftest_kick();
+#endif
         break;
     }
     case WEBSOCKET_EVENT_DISCONNECTED: