add client docs, README, CHANGELOG

docs/README.md

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+# Clients
+
+VNOX is a native-only platform. There is no web client and none is planned.
+
+## Why no web client
+
+- WebRTC adds latency overhead incompatible with VNOX's voice latency targets
+- WASM + wgpu in browser is not a viable egui deployment target today
+- Electron is explicitly rejected (it's what we're building against)
+- A browser tab is not the right environment for a persistent voice client
+
+The desktop client is a real native binary. It starts fast, uses minimal memory,
+and has direct access to audio hardware without browser sandboxing.
+
+## Clients
+
+- [desktop.md](desktop.md) — primary client, Windows / macOS / Linux
+- [mobile.md](mobile.md) — Phase 3, stack TBD
+- [overlay.md](overlay.md) — in-game HUD, Phase 2