v3.4.0 — unified release: board-named assets, full-flash images, per-chip OTA

First combined transmitter + receiver release under a single version tag.
Device firmware is functionally identical to 3.3.0 (verified booting on
ESP32 DevKit hardware); this version reworks how releases are built, named,
and delivered.

What's new

• Every binary carries its board in the filename:
  tanksync-receiver-esp32-v3.4.0.bin (ESP32 DevKit),
  tanksync-receiver-esp32s3-v3.4.0.bin (ESP32-S3 SuperMini),
  tanksync-transmitter-lora-esp32c3-v3.4.0.bin (LoRa),
  tanksync-transmitter-lite-espnow-esp32c3-v3.4.0.bin (Lite / ESP-NOW).
• Each variant ships an OTA app image (.bin) AND a full-flash image
  (…-full.bin) for blank boards (esptool write_flash 0x0).
• The receiver pulls the OTA image matched to its own chip (DevKit vs S3),
  so the two never cross-flash.

Compatibility

• Existing hubs and transmitters keep updating: each fielded variant is also
  published under its previous asset name (legacy alias), so devices on older
  firmware still find their update. Aliases retire in a later release.

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Downloads (every variant for this firmware version)

Transmitter — ESP32-C3 SuperMini

• …-transmitter-lora-esp32c3-<tag>.bin — LoRa SKU (RYLR998 module)
• …-transmitter-lite-espnow-esp32c3-<tag>.bin — Lite SKU (ESP-NOW, built-in radio, no module)

Receiver / Hub

• …-receiver-esp32-<tag>.bin — ESP32 DevKit
• …-receiver-esp32s3-<tag>.bin — ESP32-S3 SuperMini

Each variant ships two images:

• plain .bin — OTA app image, flash at 0x10000, or use the one-click browser flasher / in-app OTA.
• …-full.bin — full-flash image for a fresh/blank board, flash at 0x0 with esptool: esptool.py write_flash 0x0 <file>-full.bin.