Artemis Milestone 2f: SET_CONFIGURATION -- 2f complete

Chains off a confirmed Mass Storage/SCSI/BOT interface match via the
existing next_action deferral mechanism: device descriptor -> config
descriptor -> SET_CONFIGURATION is now a single automatic sequence.
bConfigurationValue is read directly out of the already-fetched
config_descriptor buffer, no extra transfer needed.

First write control transfer this driver has issued (every prior one was
a read), so it needed its own submission helper,
xhci_ep0_control_write_nodata() -- SET_CONFIGURATION has no Data Stage
(wLength=0), and per USB 2.0 spec 8.5.3 a no-data control transfer's
Status Stage is always IN, the reverse of an OUT-data request's status
stage. XHCI_SETUP_TRT_NO_DATA already existed in xhci.h, unused until now.

Verified live via QMP hotplug, all three architectures, worked first try,
byte-identical: "set configuration submitted" -> "device configured",
guest stays running throughout (checked via QMP query-status). Disconnect
confirmed clean on every arch afterward, no wedge. FABRIC-2.md Section X
Milestone 2f updated -- 2f is now fully complete, 2g (Bulk-Only Transport)
can start.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QPfdtaXs9ay1nbwuMnrscu

include/starkernel/xhci.h

@@ -229,10 +229,12 @@ typedef struct {
     uint16_t wLength;
 } usb_setup_packet_t;
 
-#define USB_REQ_GET_DESCRIPTOR   6u
-#define USB_DESC_TYPE_DEVICE     1u
-#define USB_DESC_TYPE_CONFIG     2u
-#define USB_DIR_DEVICE_TO_HOST   0x80u
+#define USB_REQ_GET_DESCRIPTOR    6u
+#define USB_REQ_SET_CONFIGURATION 9u
+#define USB_DESC_TYPE_DEVICE      1u
+#define USB_DESC_TYPE_CONFIG      2u
+#define USB_DIR_DEVICE_TO_HOST    0x80u
+#define USB_DIR_HOST_TO_DEVICE    0x00u
 
 /* Standard USB Interface descriptor field offsets (9 bytes, USB 2.0 spec
  * table 9-12) -- Mass Storage class detection reads these three fields.
@@ -249,6 +251,7 @@ typedef struct {
 #define USB_DESC_OFF_LENGTH           0u
 #define USB_DESC_OFF_TYPE             1u
 #define USB_CONFIG_OFF_TOTAL_LENGTH   2u  /* wTotalLength, 2 bytes, Configuration descriptor only */
+#define USB_CONFIG_OFF_CONFIG_VALUE   5u  /* bConfigurationValue -- the value SET_CONFIGURATION needs in wValue */
 #define USB_DESC_TYPE_INTERFACE      4u
 #define USB_IFACE_OFF_CLASS          5u
 #define USB_IFACE_OFF_SUBCLASS       6u