v0.0.21: FC-CRATE-1 — make warzone-protocol importable standalone

Replaced workspace dep inheritance with explicit versions in
warzone-protocol/Cargo.toml. The crate now builds both as a
workspace member AND standalone.

WZP can now import warzone-protocol directly:
  warzone-protocol = { path = "../featherChat/warzone/crates/warzone-protocol" }

This means WZP can delete its mirrored identity/crypto code and use:
- warzone_protocol::identity::{Seed, IdentityKeyPair, PublicIdentity}
- warzone_protocol::crypto::{hkdf_derive, aead_encrypt, aead_decrypt}
- warzone_protocol::ethereum::{derive_eth_identity, EthAddress}
- warzone_protocol::message::{WireMessage, CallSignalType}
- warzone_protocol::types::Fingerprint

Single source of truth for identity derivation — no more HKDF mismatches.

28/28 tests pass. Zero warnings.

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

warzone/Cargo.lock

@@ -2789,7 +2789,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-client"
-version = "0.0.20"
+version = "0.0.21"
 dependencies = [
  "anyhow",
  "argon2",
@@ -2822,7 +2822,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-mule"
-version = "0.0.20"
+version = "0.0.21"
 dependencies = [
  "anyhow",
  "clap",
@@ -2831,7 +2831,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-protocol"
-version = "0.0.20"
+version = "0.0.21"
 dependencies = [
  "base64",
  "bincode",
@@ -2856,7 +2856,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-server"
-version = "0.0.20"
+version = "0.0.21"
 dependencies = [
  "anyhow",
  "axum",
@@ -2883,7 +2883,7 @@ dependencies = [
 
 [[package]]
 name = "warzone-wasm"
-version = "0.0.20"
+version = "0.0.21"
 dependencies = [
  "base64",
  "bincode",

warzone/crates/warzone-protocol/Cargo.toml

@@ -1,25 +1,48 @@
 [package]
 name = "warzone-protocol"
-version.workspace = true
-edition.workspace = true
+version = "0.0.21"
+edition = "2021"
+license = "MIT"
+description = "Core crypto & wire protocol for featherChat (Warzone messenger)"
+rust-version = "1.75"
+
+# This crate is designed to be importable standalone — no workspace inheritance.
+# WarzonePhone and other projects can depend on it directly via path or git.
 
 [dependencies]
-ed25519-dalek.workspace = true
-x25519-dalek.workspace = true
-curve25519-dalek.workspace = true
-chacha20poly1305.workspace = true
-hkdf.workspace = true
-sha2.workspace = true
-rand.workspace = true
-bip39.workspace = true
-serde.workspace = true
-serde_json.workspace = true
-bincode.workspace = true
-thiserror.workspace = true
-hex.workspace = true
-base64.workspace = true
-uuid.workspace = true
-zeroize.workspace = true
-chrono.workspace = true
-k256.workspace = true
-tiny-keccak.workspace = true
+# Crypto
+ed25519-dalek = { version = "2", features = ["serde", "rand_core"] }
+x25519-dalek = { version = "2", features = ["serde", "static_secrets"] }
+curve25519-dalek = "4"
+chacha20poly1305 = "0.10"
+hkdf = "0.12"
+sha2 = "0.10"
+rand = "0.8"
+
+# Ethereum compatibility
+k256 = { version = "0.13", features = ["ecdsa", "serde"] }
+tiny-keccak = { version = "2", features = ["keccak"] }
+
+# BIP39
+bip39 = "2"
+
+# Serialization
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+bincode = "1"
+
+# Error handling
+thiserror = "2"
+
+# Encoding
+hex = "0.4"
+base64 = "0.22"
+
+# UUID
+uuid = { version = "1", features = ["v4", "serde"] }
+
+# Memory safety
+zeroize = { version = "1", features = ["derive"] }
+
+# Time
+chrono = { version = "0.4", features = ["serde"] }