v0.2.0

Added

• (math) speak the formula instead of announcing its MathML
• (text) share one font collection through the environment
• (graphics) [breaking] give SceneContent an intrinsic size
• (math) add waterui-math, formula rendering on the OpenType MATH table

Fixed

• (math) publish the formula's MathML on its accessibility node
• (math) redraw a bound formula when its source changes
• (math) satisfy the CI gates the local run did not reach

Other

• Merge branch 'dev' into agent/scene-invalidator-watch-274/20260906-024222
• export visual-review images under the shared artifact root
• (math) add doctests for the public entry points
• (math) paint an opaque ground under the gallery renderings
• (math) render a formula gallery on both scene engines