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.lock

@@ -4862,6 +4862,7 @@ dependencies = [
  "dialoguer",
  "directories",
  "fantoccini",
+ "futures",
  "futures-util",
  "glob",
  "hex",