Opt blocks into background.gradient and dimensions.minWidth

[Schmandarine]

Both are one-line block.json opt-ins.

background.gradient renders through the background-image longhand, so a gradient and an image can finally coexist in one declaration — which retires the hand-rolled overlay workaround in the hero pattern. safecss_filter_attr() already permits the combined value.

"supports": {
  "background": { "backgroundImage": true, "gradient": true }
}

• Add the supports to the example block, document in /create-block
• Delete the overlay workaround once the native path is confirmed
• Add dimensionSizes presets so minWidth is token-driven rather than freehand

Needs WP 7.1.

Agent surface

/create-block must know about the new supports or it will never write them → needs a @brmbh/cli release.

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Context: vault .../Development/WP-7.1-Impact.md