v0.4.4 — CTUNE centre-tune lock + External TX Inhibit

Lyra v0.4.4

Hardware / scope: Hermes Lite 2 / 2+ over HPSDR Protocol 1. RX, plus
CW / SSB / AM / DSB / SAM / FM and digital (TCI / VAC) transmit — all voice,
CW, and digital modes transmit.

New

CTUNE — centre-tune lock (RX1)

Lock the panadapter / waterfall on its current centre and tune the VFO
within the displayed span without the waterfall scrolling. The CTUN
chip (top toolbar, in the RX DSP group beside RX EQ) lights green when
engaged: the band stays put while the dial marker slides to where you're
listening — ideal for watching a fixed slice of spectrum (a pile-up, a net,
an FT8 window) and clicking signals across it. Tune past the edge of the span
and it re-centres on the new dial automatically. Click again to release and
return to normal scroll-tuning. RX1; works in any receive mode.

External TX Inhibit — hard transmit lockout

A safety lockout for when sensitive gear — a second receiver / SDR, a scope, a
spectrum analyser — shares your antenna or bench and you must be sure the radio
can't key while it's connected. Settings → TX → External TX Inhibit blocks
all transmit — MOX, foot switch / hand-mic PTT, CW, Tune, and TCI — at the
source; engaging it while transmitting drops you straight to receive. It lives
in Settings (not a one-click front-panel button) so an accidental click can't
release it, it's remembered across restarts (fail-safe), and a red ⛔ TX
INHIBIT badge shows in the top toolbar whenever it's active.

Changed

• Mic source: removed the dead "Line In" dropdown entry. The HL2+
  AK4951 board has no separate line-in jack — the single MIC jack is the
  codec mic input — so the entry advertised hardware that doesn't exist. VAC2
  stays as a greyed placeholder for a later version.

Docs

• User Guide updated with the CTUNE and External TX Inhibit sections.