…ciple I.

Hamlib's NET rigctl reference appends RPRT N to every response in both
bare and extended modes. AetherSDR's bare-mode long-form getters omitted
the terminator on 10 commands (chk_vfo, get_powerstat, hamlib_version,
get_split_freq_mode, get_vfo_list, get_modes, get_rptr_shift,
get_rptr_offs, get_ctcss_tone, get_dcs_code). Clients other than
WSJT-X — fldigi, JTDX, hamlib-cli, etc. — may stall waiting for the
missing terminator the same way WSJT-X stalled on get_lock_mode in
#3115.

Mechanical sweep: each bare branch now returns the value lines plus
rprt(0), mirroring the Hamlib reference exactly. Extended-mode
branches already carried the terminator and are unchanged. Short-form
single-character getters are left alone — they follow a different
convention that omits RPRT (see cmdGetFreq and siblings).

Each new bare-mode terminator gets a regression assertion in
tests/rigctld_test.cpp section 13 (13.11–13.20), following the
13.10 / #3115 pattern of asserting the exact two-line
{value, "RPRT 0"} response. get_split_freq_mode is 4 lines bare
(freq, mode, passband, RPRT 0) and accepts the alternate "RPRT -1"
shape when no TX slice exists.

Principle I (FlexLib / upstream-protocol authority): Hamlib's NET
rigctl backend is the reference for this on-wire protocol; the bare-mode
omission was a divergence from that reference. Restoring conformance
is the load-bearing principle.

Blast radius: codegraph impact on processCommand reports
risk_score=0.104 with 5 high-risk downstream model accessors
(RadioModel::transmitModel/sendCmd/isConnected/sendCmdPublic,
SliceModel::sliceId). These are read by the cmd handlers that the
unchanged branches dispatch to; the edits here are purely textual
additions to return values and do not touch handler bodies or any
downstream model state. The PreToolUse file-level hook flagged
risk_score=0.182 with MainWindow as a transitive caller via header
inclusion — same conclusion: text-only return-value change, no
behavioural ripple.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>