Mesh Gemini v0.2.9 — hybrid phone milestone

Mesh Gemini v0.2.9 — hybrid phone milestone (pre-release)

T-Deck Plus hybrid communicator: MeshCore LoRa texting + Reticulum/LXMF
messaging and LXST voice over WiFi, in one launcher.

New in this release

• Native-8k call playback — call audio now bypasses the mixer's
  resample path for the duration of a call (fixes RX garble); the mixer
  is restored automatically at every call end, including abnormal ones.
• Persistent conversations in the RNS app — messages survive
  reboot; conversation rows appear even for peers that haven't
  announced since boot; Address Book contact names (nicknames) always
  take priority over broadcast names.
• Status bar — WiFi / AutoInterface / TCP indicators
  (green = up, amber = enabled but not up, grey = off); clock
  decluttered to HH:MM.

Status

⚠ Pre-release: builds pass and bench flashing is done, but
on-device verification of the new call-audio path and persistence UI
is still in progress. Expect a follow-up release once testing completes.

Flashing (esp32s3, 460800 baud)

• Fresh install: mesh-gemini-v0.2.9-merged.bin at offset 0x0
• Firmware-only update (keeps your data): mesh-gemini-v0.2.9-firmware.bin at 0x10000
• Data image: mesh-gemini-v0.2.9-littlefs.bin at 0x590000 —
  ⚠ erases on-device user data (address book, messages; identities
  stored in NVS survive)
• mesh-gemini-v0.2.9-test-firmware.bin: bench/test build with serial
  test hooks (T: commands) enabled — for development use
• mesh-gemini-v0.2.9-launcher.bin: image for Launcher-based installs

License: GPL-3.0 (see COPYING / NOTICE). Built from hybrid-phone @ acaccb5.