[P1] Minimal embeddable widget (Web Component + Shadow DOM + dialog)

[thorwhalen]

One script tag, framework-agnostic, no install. Default (minimal) capture only.

• Tiny async loader (buffered command queue) + versioned bundle
• Web Component with open Shadow DOM; native <dialog> modal (avoids Radix/focus-trap-in-Shadow-DOM breakage)
• Declarative data-* auto-mount + imperative init({...})
• Default capture: screenshot (modern-screenshot/html-to-image) + page URL + env; lazy-load the rasterizer
• POST a Report; thin optional React wrapper over the same element

Note: client screenshots are DOM re-renders (break on cross-origin/canvas/CSS) and can bake in PII — see #6. Lives under widget/. Design: design.md (Widget architecture) · #1