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Build me a template-driven image generator for the handful of formats I actually publish.

STACK
- Node with satori for layout and resvg for rasterising; no headless browser
- Templates as JSX components, checked into the repository

TEMPLATES
- One component per format: social card, quote card, blog header
- Props typed: title, subtitle, author, image URL, theme name
- Fonts loaded from local WOFF2 files, never from a network at render time

RENDERING
- POST /render with a template name and props, returning PNG at 2x
- Deterministic output: the same props produce a byte-identical file, so it can be cached by hash
- A queue with a concurrency limit, because rasterising is CPU-bound

TEXT THAT DOES NOT BREAK
- Measure and shrink the title to fit a fixed box, stepping down a defined scale — never overflow, never scale mid-word
- Balance the last line, and cap at three lines with an ellipsis

BRAND
- Colours and fonts from the same token file the site uses; no second copy
- A contrast check on the rendered text colour against its background, failing the render rather than shipping something unreadable

BATCH
- A CSV in, a folder of images out, for the recurring cases

WHAT IS NOT HERE
- A canvas, a drag-and-drop editor, stock assets or background removal

Include a README with the render time per image, the font licences used, and how to add a template.