docs: add Phase 8-2 networking status, spec, plan, and deferred items

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/superpowers/plans/2026-03-25-phase8-2-networking.md

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+# Phase 8-2: Networking Foundation Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** UDP 기반 클라이언트-서버 네트워킹 인프라 — 패킷 직렬화, 연결 핸드셰이크, 데이터 송수신
+
+**Architecture:** `voltex_net` crate 신규. 바이너리 패킷 프로토콜 + non-blocking UdpSocket 래퍼 + NetServer(클라이언트 관리) + NetClient(서버 연결). std::net만 사용.
+
+**Tech Stack:** Rust, std::net::UdpSocket
+
+**Spec:** `docs/superpowers/specs/2026-03-25-phase8-2-networking.md`
+
+---
+
+## Task 1: Crate + Packet 직렬화
+
+Create crate, packet.rs with Packet enum and binary serialization.
+
+- Cargo.toml: no dependencies
+- Workspace: add members + workspace.dependencies
+- Packet enum: Connect, Accept, Disconnect, Ping, Pong, UserData
+- Header: [type u8, payload_len u16 LE, reserved u8]
+- to_bytes(), from_bytes()
+- 6 tests: roundtrip per variant + invalid bytes error
+
+Commit: `feat(net): add voltex_net crate with packet serialization`
+
+## Task 2: NetSocket + NetServer + NetClient
+
+Create socket.rs, server.rs, client.rs with full networking.
+
+- NetSocket: bind(non-blocking), send_to, recv_from
+- ClientInfo, ServerEvent, NetServer: poll, broadcast, send_to_client
+- ClientEvent, NetClient: connect, poll, send, is_connected, disconnect
+- Tests: localhost handshake, UserData roundtrip, disconnect
+
+Commit: `feat(net): add UDP server/client with connection management`
+
+## Task 3: Documentation
+
+Update STATUS.md and DEFERRED.md.
+
+Commit: `docs: add Phase 8-2 networking status and deferred items`