Fix: include workspace metadata in prompts (#58)

[avivsinai]

Summary

• route VS Code extension prompt generation through shared promptGenerator so workspace name/root reach the LLM
• allow instructions-only prompts when no workspace is open; keep file-inclusive prompts gated on workspace
• add regression test for workspace metadata and update docs/build to cover it

Testing

• npm test

Resolves #58

[avivsinai]

@inter1965 we reopened #58 and pushed a fix that routes the extension through the shared prompt generator (workspace name/root included) plus a regression test. All checks are green. Could you please review before we merge?