renesas: vendor CDBs from pioneer-optical

The identity read (3C 02 F1), the two gated memory reads (3C 02 B0 at 0x04
and 0x500000, 0xA4 bytes) and the read-unlock knock (3B 02 41 A5 AA AA) come
from the crate's constructors; the bytes on the wire are unchanged and the
knock test still pins them. The crate's flash::read_memory is not used: it
knocks before every read and stops on a refused knock, where this sequence
reads first and tries the second window even when the knock is refused.

CHANGELOG.md

@@ -4,6 +4,7 @@
 
 ### Changed
 
+- The Renesas/Pioneer unlocker builds its vendor CDBs (identity read, gated memory reads, read-unlock knock) with the `pioneer-optical` crate instead of hard-coded bytes; the commands sent are unchanged.
 - AACS handshake diagnostics that a scan now reports itself log below WARN: unsupported or unverifiable drive certs, VID read failures and transport faults at DEBUG, `read_data_key_dropped` at INFO.
 
 ## [1.7.7] — 2026-09-26