blog: Welcome to the New Squad — v0.8.18 launch post (#22)

Comprehensive blog post covering all changes from beta to v0.8.18:
CLI features, SDK capabilities, 8 samples walkthrough, security
hardening, TypeScript rewrite, and migration guide.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: bradygaster