feat: WarzonePhone lossy VoIP protocol — Phase 1 complete

Rust workspace with 7 crates implementing a custom VoIP protocol
designed for extremely lossy connections (5-70% loss, 100-500kbps,
300-800ms RTT). 89 tests passing across all crates.

Crates:
- wzp-proto: Wire format, traits, adaptive quality controller, jitter buffer, session FSM
- wzp-codec: Opus encoder/decoder (audiopus), Codec2 stubs, adaptive switching, resampling
- wzp-fec: RaptorQ fountain codes, interleaving, block management (proven 30-70% loss recovery)
- wzp-crypto: X25519+ChaCha20-Poly1305, Warzone identity compatible, anti-replay, rekeying
- wzp-transport: QUIC via quinn with DATAGRAM frames, path monitoring, signaling streams
- wzp-relay: Integration stub (Phase 2)
- wzp-client: Integration stub (Phase 2)

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

Cargo.toml

@@ -0,0 +1,51 @@
+[workspace]
+resolver = "2"
+members = [
+    "crates/wzp-proto",
+    "crates/wzp-codec",
+    "crates/wzp-fec",
+    "crates/wzp-crypto",
+    "crates/wzp-transport",
+    "crates/wzp-relay",
+    "crates/wzp-client",
+]
+
+[workspace.package]
+version = "0.1.0"
+edition = "2024"
+license = "MIT OR Apache-2.0"
+rust-version = "1.85"
+
+[workspace.dependencies]
+# Shared
+bytes = "1"
+thiserror = "2"
+async-trait = "0.1"
+tokio = { version = "1", features = ["full"] }
+tracing = "0.1"
+tracing-subscriber = "0.3"
+serde = { version = "1", features = ["derive"] }
+
+# Transport
+quinn = "0.11"
+
+# FEC
+raptorq = "2"
+
+# Codec
+audiopus = "0.3.0-rc.0"
+
+# Crypto
+x25519-dalek = { version = "2", features = ["static_secrets"] }
+ed25519-dalek = { version = "2", features = ["rand_core"] }
+chacha20poly1305 = "0.10"
+hkdf = "0.12"
+sha2 = "0.10"
+rand = "0.8"
+
+# Workspace crates
+wzp-proto = { path = "crates/wzp-proto" }
+wzp-codec = { path = "crates/wzp-codec" }
+wzp-fec = { path = "crates/wzp-fec" }
+wzp-crypto = { path = "crates/wzp-crypto" }
+wzp-transport = { path = "crates/wzp-transport" }