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/components/esp_hosted/common/rpc/esp_hosted_rpc.h

@@ -0,0 +1,37 @@
+/*
+ * SPDX-FileCopyrightText: 2025 Espressif Systems (Shanghai) CO LTD
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Holds RPC defines common to Hosted Slave and Master
+ */
+
+#ifndef __ESP_HOSTED_RPC__H
+#define __ESP_HOSTED_RPC__H
+
+/*
+ * check components/esp_common/src/esp_err_to_name.c for
+ * unused error range
+ */
+#define ESP_ERR_HOSTED_BASE (0x2f00)
+
+enum {
+	RPC_ERR_BASE = ESP_ERR_HOSTED_BASE,
+	RPC_ERR_NOT_CONNECTED,
+	RPC_ERR_NO_AP_FOUND,
+	RPC_ERR_INVALID_PASSWORD,
+	RPC_ERR_INVALID_ARGUMENT,
+	RPC_ERR_OUT_OF_RANGE,
+	RPC_ERR_MEMORY_FAILURE,
+	RPC_ERR_UNSUPPORTED_MSG,
+	RPC_ERR_INCORRECT_ARG,
+	RPC_ERR_PROTOBUF_ENCODE,
+	RPC_ERR_PROTOBUF_DECODE,
+	RPC_ERR_SET_ASYNC_CB,
+	RPC_ERR_TRANSPORT_SEND,
+	RPC_ERR_REQUEST_TIMEOUT,
+	RPC_ERR_REQ_IN_PROG,
+	RPC_ERR_SET_SYNC_SEM,
+};
+
+#endif