v0.0.2: add version display, detailed self-test with step-by-step decrypt

- Version shown on chat load (v0.0.2)
- Self-test now does step-by-step: X3DH shared secret comparison,
  then manual ratchet init + decrypt (not via decrypt_wire_message)
- Shows: rng output, shared_match, alice/bob shared secrets, decrypt result
- This isolates whether X3DH or ratchet or AEAD fails

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

warzone/Cargo.toml

@@ -9,7 +9,7 @@ members = [
 ]
 
 [workspace.package]
-version = "0.1.0"
+version = "0.0.2"
 edition = "2021"
 license = "MIT"
 rust-version = "1.75"