Add full web-port plan (WebSockets + WebRTC, no ENet)

docs/web_port_plan.md

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+# AssaultCube Full Web Port Plan (No ENet)
+
+This document outlines a **full web-native port** strategy for AssaultCube with:
+
+- Rendering: **WebGL2**
+- Networking: **WebSockets** (gameplay + control plane)
+- Voice chat: **WebRTC audio**
+- Transport: **No ENet dependency** in the browser client
+
+## 1) Target Architecture
+
+### 1.1 Client Runtime (Browser)
+- WASM module for core simulation/gameplay logic.
+- JavaScript/TypeScript host for platform integrations:
+  - WebGL2 rendering backend
+  - Input (pointer lock, keyboard, gamepad)
+  - Asset loading / persistence
+  - WebSocket connection manager
+  - WebRTC voice stack
+
+### 1.2 Server Runtime
+- Native authoritative game server process.
+- Replace ENet-based client transport path with a **WebSocket session layer**.
+- Optional gateway process if you want to preserve native server internals while iterating.
+
+### 1.3 Signaling and Presence
+- WebSocket control channel handles:
+  - login/session
+  - lobby/room join
+  - voice channel membership
+  - player metadata and moderation controls
+
+## 2) Networking Without ENet
+
+### 2.1 WebSocket Protocol Model
+- Use binary frames (`ArrayBuffer`) for compact game packets.
+- Packet envelope:
+  - protocol version
+  - message type
+  - sequence number
+  - ack bitset (for selective reliability)
+  - payload
+
+### 2.2 Reliability Classes
+Implement ENet-like behavior at app layer:
+- **Reliable ordered**: chat, inventory/stateful commands.
+- **Unreliable sequenced**: position/aim snapshots.
+- **Reliable unordered** (optional): non-order-dependent control events.
+
+### 2.3 Lag Compensation and Tick Model
+- Server authoritative fixed tick (e.g., 60 Hz).
+- Client sends input commands stamped with local tick.
+- Server echoes authoritative state + last processed input tick.
+- Client performs prediction + reconciliation.
+
+### 2.4 Match/Server Discovery
+- Replace LAN broadcast discovery with:
+  - central match service list endpoint, and/or
+  - region lobby shards.
+
+## 3) Voice Chat via WebRTC
+
+### 3.1 Topology
+For solo development, start with **SFU-based group voice**:
+- Easier scaling than full mesh.
+- Lower uplink cost for players in larger rooms.
+
+### 3.2 Signaling
+Reuse existing WebSocket channel for WebRTC signaling:
+- SDP offer/answer
+- ICE candidates
+- channel membership updates
+
+### 3.3 Audio Pipeline
+- Capture mic with `getUserMedia`.
+- Apply browser AEC/NS/AGC constraints.
+- Optional positional attenuation done client-side in WebAudio gain graph.
+
+### 3.4 Moderation/UX Controls
+- Push-to-talk, mute self, mute remote.
+- Server-side role checks for room moderation commands.
+
+## 4) Rendering Migration (WebGL2)
+
+### 4.1 Core Changes
+- Remove fixed-function/immediate mode assumptions.
+- Introduce render abstraction:
+  - static world geometry
+  - skinned/animated meshes
+  - particles
+  - HUD/2D overlays
+
+### 4.2 Shader and Material System
+- Material definition -> shader variant mapping.
+- Texture atlas and sampler state registry.
+- Uniform buffer patterns for per-frame/per-object data.
+
+### 4.3 Performance Baseline
+- Frustum culling + coarse occlusion strategy.
+- Minimize WebGL state changes.
+- Batch UI quads and decals.
+
+## 5) Security Model
+- Validate all gameplay messages server-side.
+- Signed session tokens for websocket auth.
+- Rate limiting for chat and command endpoints.
+- Voice room auth tied to game session identity.
+
+## 6) Delivery Plan (Solo-Optimized)
+
+### Milestone A (2 weeks)
+- Browser boot + input + single map render.
+- WebSocket connect/login + ping.
+- No combat, no voice.
+
+### Milestone B (3-4 weeks)
+- Core movement/combat replicated.
+- Prediction + reconciliation stable.
+- HUD and weapon rendering parity for a reduced weapon set.
+
+### Milestone C (2-3 weeks)
+- Match flow: lobby -> game -> postgame.
+- Chat + moderation basics.
+- WebRTC voice in party/team channels.
+
+### Milestone D (ongoing)
+- Performance tuning, anti-cheat hardening, content parity.
+- Expand maps/modes and regression tooling.
+
+## 7) Immediate Task List
+1. Define binary packet schema + protocol versioning doc.
+2. Implement websocket session manager (client and server).
+3. Build server tick/input pipeline with reconciliation hooks.
+4. Add prediction for movement + firing.
+5. Implement WebRTC signaling over existing websocket channel.
+6. Bring up SFU (or managed provider) for room voice.
+7. Add end-to-end telemetry: RTT, jitter, packet loss, tick drift.
+8. Add deterministic replay snippets for regression tests.
+
+## 8) Non-Goals for Initial Launch
+- Full feature parity with every legacy mode/map.
+- Perfect visual parity with native renderer on day one.
+- Browser P2P authoritative gameplay (server remains authoritative).
+