v3.2.0-rc.1 — 3.2.0 release candidate

Release candidate for 3.2.0. Rolls up the entire 3.2.0-beta line — if this soaks clean on real gateways, it promotes to the 3.2.0 stable release.

New since beta.14

• Per-phase EM340 / Power-Boost meter diagnostics — new MQTT sensors for per-phase mains voltage (Mains Voltage L2/L3) and house current (House Current L2/L3), alongside the existing per-phase Grid Power L1/L2/L3. A 3-phase meter now exposes full per-phase voltage, current and power. Diagnostic-category, auto-hidden when no meter is fitted; L2/L3 read 0 on single-phase. (Community contribution — thanks @hannesjanno, #22.)
• OTA failures are now self-correcting + diagnosable — a failed flash no longer leaves BLE paused (it un-pauses immediately so a retry works), and the error now carries the real flash-layer reason (flash begin failed, flash write failed, bad magic byte, or truncated) instead of a generic "Upload failed".

How to install

• From Home Assistant: the Wallbox Gateway integration's Update entity will offer 3.2.0-rc.1 (it's marked pre-release — enable pre-releases if you want it before stable).
• Fresh flash: use the ESP Web Tools one-click installer on the repo, or USB-flash the attached firmware.bin / bootloader.bin / partitions.bin.

This is a pre-release for soak-testing. Please report anything odd against the tracker; if it's stable, 3.2.0 stable follows.

Full notes: see CHANGELOG.md.