feat(frank-dragoon): open the NPU node the way rootless can actually reach it

The armed boot reached the engine and died in its own preflight:

  halogen npu: /dev/accel/accel0 is here, but this process cannot open it
    (crw-rw---- nobody:nogroup).

The node is root:render 0660 and a rootless container maps exactly one uid/gid,
so `render` is unmapped inside it and `--group-add keep-groups` — the vendor's
advice, and the ComfyUI pattern for /dev/kfd — cannot grant a group the
namespace does not map. Measured 2026-10-19 from a `dank` shell already in
`render`: without the flag denied, with the flag denied, with the udev mode
0666 the open succeeds (OPEN_OK). Same wall 99-comfyui-gpu-access.rules already
solved for the GPU compute nodes, so the accel node gets its counterpart:

  dankclaw/udev/98-halogen-npu-access.rules — KERNEL=="accel[0-9]*",
  SUBSYSTEM=="accel", MODE="0666"

The deployer installs the rule, reloads rules, re-triggers the node and only
then checks the mode; the serve script refuses any node that is not
other-writable, naming the rule, so this cannot return as a crash loop (189
restarts while chat was down is the failure mode being closed).

Both checks read the permission bit directly: `[ -o FILE ]` is not
"other-writable" — it means "exists" and `-o` doubles as the OR operator inside
test, which is why the first cut of the gate refused everything.

Dragoon seam: 33 -> 35 tests. The fixture node is 0666 like the installed one,
a 0660 node is refused with the rule named and nothing rendered, and the rule
file's shape plus the deployer's install/trigger are asserted.

scripts/deploy-remote.sh

@@ -1452,6 +1452,20 @@ deploy_llm_dragoon() {
             echo "ERROR: NPU node $LLM_DRAGOON_DEV_ACCEL absent — amdxdna is not bound (is iommu=pt still on the boot line?)" >&2
             return 1
         fi
+        # Access, not existence: a rootless container cannot open a root:render
+        # 0660 node (its namespace maps one uid/gid, and keep-groups cannot grant
+        # an unmapped gid — measured 2026-10-19). Install the mode rule, re-trigger
+        # the node, then PROVE the node is other-accessible before the restart.
+        run_privileged install -m 0644 dankclaw/udev/98-halogen-npu-access.rules \
+            /etc/udev/rules.d/98-halogen-npu-access.rules
+        run_privileged udevadm control --reload-rules
+        run_privileged udevadm trigger --sysname-match="$(basename "$LLM_DRAGOON_DEV_ACCEL")"
+        # (`-o FILE` is not "other-writable" — it means "exists", and `-o` is also
+        # the OR operator inside test), so the bit is read straight off the mode.
+        if [[ $(( 8#$(stat -c '%a' "$LLM_DRAGOON_DEV_ACCEL") & 8#2 )) -eq 0 ]]; then
+            echo "ERROR: $LLM_DRAGOON_DEV_ACCEL is still $(stat -c '%a %U:%G' "$LLM_DRAGOON_DEV_ACCEL") after installing the access rule — the lane cannot open it rootless" >&2
+            return 1
+        fi
         for xl in libxrt_coreutil.so.2 libxrt_core.so.2 libxrt_driver_xdna.so.2; do
             if [[ ! -e "$LLM_DRAGOON_XRT_DIR/$xl" ]]; then
                 echo "ERROR: XRT NPU library $LLM_DRAGOON_XRT_DIR/$xl absent (Ubuntu libxrt2 + libxrt-npu2)" >&2