Merge PR #500: streaming support and security fixes

- feat(streaming): add streaming support for LLM responses (fixes #211)
- security(deps): remove vulnerable xmas-elf dependency via embuild (fixes #399)
- fix: resolve merge conflicts and integrate chat_with_tools from main

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Cargo.toml

@@ -3,7 +3,7 @@ name = "zeroclaw"
 version = "0.1.0"
 edition = "2021"
 authors = ["theonlyhennygod"]
-license = "MIT"
+license = "Apache-2.0"
 description = "Zero overhead. Zero compromise. 100% Rust. The fastest, smallest AI assistant."
 repository = "https://github.com/zeroclaw-labs/zeroclaw"
 readme = "README.md"
@@ -85,6 +85,7 @@ glob = "0.3"
 # Discord WebSocket gateway
 tokio-tungstenite = { version = "0.24", features = ["rustls-tls-webpki-roots"] }
 futures-util = { version = "0.3", default-features = false, features = ["sink"] }
+futures = "0.3"
 hostname = "0.4.2"
 lettre = { version = "0.11.19", default-features = false, features = ["builder", "smtp-transport", "rustls-tls"] }
 mail-parser = "0.11.2"