Comma Sync gui-v1.0.3-beta.1 — Go core beta (all platforms)

Beta builds powered by the new shared Go core — the same engine across
macOS, Linux, and Windows (native SSH/SFTP + discovery; only ffmpeg is
external). The stable macOS app on main is unaffected.

What's here

• macOS: Comma-Sync-Go-macOS.zip — the SwiftUI app wired to the Go core.
• Linux: .AppImage (chmod +x then run) or .deb (sudo apt install ./*.deb).
• Windows: the .msi (or NSIS *-setup.exe).

This round ports all the script's fixes into the core: correct per‑segment
audio sync (no more drift / mic‑start gap), mDNS discovery (no
WiFi‑disrupting scan), the power‑throttle, and an optional combined
multi‑angle video (2 cameras side by side, or 3 with a main angle on top and
the other two below — reuses already‑rendered clips when present). A built‑in
update check (on by default, toggle to disable) points you at the next beta.
SHA‑256 checksums for every file are attached (*SHA256SUMS*).

One requirement: ffmpeg/ffprobe on your PATH.
(brew install ffmpeg / sudo apt install ffmpeg / winget install Gyan.FFmpeg.)
macOS/Windows are ad‑hoc/unsigned, so allow them on first launch (macOS: right‑click → Open).

See the GUI README.

⚠️ Pre-release for testing — the macOS build works in basic testing; Linux
and Windows haven't been verified against a comma on real hardware yet.
Please test and report any bugs.