feat: Sprint 7 — Go SDK with QUIC transport and Cap'n Proto RPC

First non-Rust client SDK for quicproquo ecosystem.

- Cap'n Proto codegen: generated 6487-line Go types from node.capnp
  with all 24 RPC methods (NodeService, Auth, Envelope)
- QUIC transport: quic-go + TLS 1.3, ALPN "capnp", single bidi stream,
  300s idle timeout, InsecureSkipVerify for dev, custom CA cert support
- High-level qpq package: Connect, Health, ResolveUser, CreateChannel,
  Send/SendWithTTL, Receive/ReceiveWait, DeleteAccount, OPAQUE wrappers
- Auth management: session token storage, version/token/deviceID on all RPCs
- Example program and README with API reference

All tests pass: go test ./..., go vet, go build
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2026-03-04 01:03:02 +01:00
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