Live-Sync polls read_active_profile() every 1.5s, but it was requesting
a full 740-byte config dump (~124 chunk packets) just to read one
byte out of it. The firmware handles CONFIG_READ synchronously and
blocking, which delayed its LED animation update enough to make
Pulse/Blink visibly stutter on every poll cycle -- see
VersaMCU's doc/07_serial_protocol.md ("READ_STATUS vs. CONFIG_READ
fuer Polling") for the root-cause writeup on the firmware side.
read_active_profile() now sends VersaMCU's new CMD_READ_STATUS (0x06)
and reads back a single EVT_STATUS (0x86) packet instead of driving
the chunked dump protocol. Requires the corresponding firmware update
(VersaMCU commit "Add lightweight READ_STATUS command..."); older
firmware without it just times out gracefully (last_error stays
"timeout", no crash).
desktop_viewer.py's SERIAL_POLL_S/SERIAL_IDLE_S already sit back at
their original 1.5s/3.0s (temporarily raised to 8s as a stopgap before
the firmware fix landed) since the expensive dump is gone now.
Verified end-to-end against a freshly flashed board: correct profile
returned, no more visible LED stutter with Live-Sync on.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
