v0.1.0-alpha.2

Image source resolution. <img src> now resolves from the (previously inert) images and baseUrl render options.

• images: a Record<string, Uint8Array> mapping an <img>'s src to raw bytes; the format (PNG/JPEG/GIF/WebP) is detected from the bytes.
• baseUrl: normalizes a relative src into the images lookup key. No network or filesystem I/O on the render path — determinism is preserved.
• Inline data: URLs continue to render.

BREAKING: a renderable <img> whose src cannot be resolved (missing images entry, remote/unknown-scheme URL, unsupported/malformed data: URL, or unrecognized bytes) now rejects with a located image:unresolved diagnostic instead of rendering blank. A src-less or empty src is skipped silently.

See #7.