chore: release 0.1.2

[MiloszFilimowski]

Version bump to 0.1.2.

What ships

• Background blur outline: no halo of the person's colours in the blurred background, a smooth edge that hugs the body, no sharp background left next to the person (feat(blur): blur only the background and give the outline a smooth, tight edge #2).
• Same GPU cost per frame as 0.1.1: the outline weight is computed once per frame at half resolution.

Verified in Chrome with the minimal-react example against a sandbox room (see #2 for numbers).

https://claude.ai/code/session_01FWRoR5MneE6GE9crQ9tF6W