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Implement the WebSDK/NWAFP Get DOS Name From Entry ID subfunction (NCP 0x2222/35/18) as a conservative, read-only reverse lookup over mars_nwe's existing volume and AFP metadata infrastructure. The documented request carries a volume number and 32-bit Macintosh directory entry ID, and the reply returns a length-prefixed DOS path string. mars_nwe's current AFP entry IDs are not the namespace base handles maintained by namspace.c; they are mars_nwe/libatalk AFP metadata IDs cached through nwatalk. Reuse the existing volume table as the search root and nwatalk_get_entry_id() as the identity probe instead of inventing a parallel namespace handle mapping. The reverse lookup deliberately does not create fallback IDs while walking the volume. It only matches entries that already have mars_nwe or Netatalk AFP metadata, which is the normal smoke-test sequence after Get Entry ID, Get File Information, or Scan File Information has cached the target ID. This keeps the lookup read-only and avoids populating entry-id xattrs across an entire volume as a side effect. Add a Linux afp_dos_name_smoke helper and wire it into the AFP smoke suite. The helper can resolve the supplied VOL:PATH to an entry ID first, then sends the 0x12 request and verifies the returned path without the volume prefix. The suite continues to exercise the existing path-backed AFP compatibility flow before future create/rename/remove work. Tests:\n- git diff --check\n- bash -n tests/linux/afp_smoke_suite.sh\n- gcc -Iinclude -I/mnt/data/stubs -fsyntax-only tests/linux/afp_dos_name_smoke.c\n\nTODO:\n- Replace the volume walk with a real CNID/base-ID index when persistent AFP identity storage grows one.\n- Return true DOS 8.3 aliases once the AFP reverse lookup is wired to the namespace alias helpers rather than preserving the cached path component spelling.