Roadmap: pl2303 joins the out-of-tree modules

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01DDwfd6Ki8UfG4hK6W5YpJz

docs/ROADMAP.md

@@ -21,7 +21,7 @@ Getting the Jetson to see the hardware at all.
 - [x] SIM7600 LTE data path: QMI (self-built `qmi_wwan`), povo, metered, ranked
       below Ethernet/WiFi; failover tested, Tailscale stays reachable over LTE
 - [x] SIM7600 GNSS via gpsd (`/dev/sim7600-gps`): 3D fix in the car
-- [x] Kernel-update procedure for the out-of-tree modules (`pcan`, `qmi_wwan`) —
+- [x] Kernel-update procedure for the out-of-tree modules (`pcan`, `qmi_wwan`, `pl2303`) —
       documented, sources kept in `~/infra`; still manual, and breaks silently
       if forgotten
 - [x] Network time pinned to NICT; timezone `Asia/Tokyo`