feat(iso15): hf.iso15.raw() — send an arbitrary ISO15693 request frame

The 15693 catalog builds request frames (flags | command | [mfg] | [UID] | params) but there was
no transport to send them — rawcli's hf15 raw path fetched a nonexistent hf.iso15.raw and got
None, so nothing executed. Add it: raw() takes the frame without a CRC (appended host-side via
_iso15_payload), sends CMD_HF_ISO15693_COMMAND, and returns the firmware-relayed tag response.
long_wait selects the write-length tag-ack timeout for WRITE/LOCK-class commands.

This is the foundation for the ICODE SLIX/SLIX2/NTAG5 catalogs. Hardware-verified against an ICODE
SLIX: GET_SYSTEM_INFO (32 blocks, IC ref 0x96, no READ_SIGNATURE → SLIX-family), READ_BLOCK,
GET_RANDOM_NUMBER, and the NXP custom 02 B2 04 form all round-trip.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

tests/test_hf_15.py

@@ -20,6 +20,24 @@ def test_15_scan():
     assert "uid" in result
 
 
+def test_15_raw():
+    from pm3py.core.protocol import crc15_bytes
+    t = AsyncMock()
+    iso15 = HF15Commands(t)
+    resp_data = bytes([0x00, 0x00, 0x11, 0x22, 0x33, 0x44, 0x96, 0x3A])  # flags + data + crc
+    t.send_ng.return_value = PM3Response(cmd=Cmd.HF_ISO15693_COMMAND, status=0,
+                                         reason=0, ng=True, data=resp_data)
+    # send a raw request frame (no CRC); it should be CRC'd + wrapped, and the tag reply returned
+    r = asyncio.get_event_loop().run_until_complete(iso15.raw(b"\x02\x20\x00"))
+    assert r["status"] == 0 and r["raw"] == resp_data and r["data"] == resp_data.hex()
+    payload = t.send_ng.call_args.args[1]          # [flags(1)][len(2)][iso_cmd][crc15(2)]
+    assert payload[3:6] == b"\x02\x20\x00"          # the frame, verbatim
+    assert payload[6:8] == crc15_bytes(b"\x02\x20\x00")   # ISO15693 CRC appended host-side
+    # a hex string is accepted too
+    asyncio.get_event_loop().run_until_complete(iso15.raw("02 B2 04"))
+    assert t.send_ng.call_args.args[1][3:6] == b"\x02\xB2\x04"
+
+
 # ---- Tracelog parsing ----
 
 def _make_tracelog_entry(timestamp, duration, is_response, data):