docs: rewrite mdBook documentation for v2 architecture

Update 25+ files and add 6 new pages to reflect the v2 migration from
Cap'n Proto to Protobuf framing over QUIC. Integrates SDK and Operations
docs into the mdBook, restructures SUMMARY.md, and rewrites the wire
format, architecture, and protocol sections with accurate v2 content.

docs/src/SUMMARY.md

@@ -23,12 +23,6 @@
 - [TLS in quicproquo](getting-started/tls.md)
 - [Certificate Lifecycle and CA-Signed TLS](getting-started/certificate-lifecycle.md)
 - [Docker Deployment](getting-started/docker.md)
-- [Go SDK](getting-started/go-sdk.md)
-- [TypeScript SDK and Browser Demo](getting-started/typescript-sdk.md)
-- [C FFI Bindings](getting-started/ffi.md)
-- [WASM Integration](getting-started/wasm.md)
-- [Bot SDK](getting-started/bot-sdk.md)
-- [Code Generators (qpq-gen)](getting-started/generators.md)
 - [Mesh Networking](getting-started/mesh-networking.md)
 - [Demo Walkthrough: Alice and Bob](getting-started/demo-walkthrough.md)
 
@@ -48,12 +42,24 @@
 
 - [Protocol Layers Overview](protocol-layers/overview.md)
 - [QUIC + TLS 1.3](protocol-layers/quic-tls.md)
-- [Cap'n Proto Serialisation and RPC](protocol-layers/capn-proto.md)
+- [Protobuf Framing](protocol-layers/capn-proto.md)
 - [MLS (RFC 9420)](protocol-layers/mls.md)
 - [Hybrid KEM: X25519 + ML-KEM-768](protocol-layers/hybrid-kem.md)
 
 ---
 
+# Client SDKs
+
+- [SDK Overview](sdk/index.md)
+- [Wire Format Reference](sdk/wire-format.md)
+- [Rust SDK](sdk/rust.md)
+- [Go SDK](getting-started/go-sdk.md)
+- [TypeScript SDK and Browser Demo](getting-started/typescript-sdk.md)
+- [C FFI Bindings](getting-started/ffi.md)
+- [WASM Integration](getting-started/wasm.md)
+
+---
+
 # Cryptographic Properties
 
 - [Cryptography Overview](cryptography/overview.md)
@@ -97,15 +103,23 @@
 
 ---
 
-# Roadmap and Research
+# Roadmap
 
 - [Milestone Tracker](roadmap/milestones.md)
-- [Phase 2 + M4–M6 Roadmap](roadmap/phase2-and-m4-m6.md)
+- [Phase 2 + M4-M6 Roadmap](roadmap/phase2-and-m4-m6.md)
 - [Production Readiness WBS](roadmap/production-readiness.md)
 - [Auth, Devices, and Tokens](roadmap/authz-plan.md)
 - [1:1 Channel Design](roadmap/dm-channels.md)
 - [Future Research Directions](roadmap/future-research.md)
-- [Full Roadmap (Phases 1–8)](../../ROADMAP.md)
+- [Full Roadmap (Phases 1-8)](../../ROADMAP.md)
+
+---
+
+# Operations
+
+- [Monitoring](operations/monitoring.md)
+- [Backup and Restore](operations/backup-restore.md)
+- [Scaling Guide](operations/scaling-guide.md)
 
 ---