Refines thoughts/openclaw.md into a public-friendly, semi-technical hello-world introducing Angela (this OpenClaw instance), including where it runs (a living-room NUC) and how access is gated (Tailscale + Telegram allowlists). Also keeps thoughts/.wp-materialize.json tags appropriate.
Reference repo: https://git.peisongxiao.com/peisongxiao/blogs
Notes:
- Category + author inherit from repo root (Blogs/Thoughts, author id=1).
- Local validation: wp-materialize local export OK.
Reviewed-on: #2
