chore: prepare Wistia plugin 1.0.0 branding

[PatriceDouge]

Context / Why

Cursor’s publisher form requests a 1:1 SVG or PNG with a background plate. The existing plugin asset is a horizontal wordmark, so this prepares the official Wistia plugin’s marketplace branding and establishes its first public release version before submission.

How

• Add a square SVG using Wistia’s canonical optical emblem centered on an opaque white rounded plate with a subtle border.
• Point the Cursor plugin manifest at the square asset while retaining the existing horizontal logo in the repository.
• Set the Cursor manifest, portable Agent Plugin manifest, and marketplace metadata to the initial public SemVer release, 1.0.0.
• Keep the Agent Plugins $schema independently pinned to specification version 1.0.0.

Testing

Validation

Validated locally at 512px and 64px (2026-09-02) — PASS

Check	Result
Rendered the square SVG at marketplace and small-icon sizes and confirmed the emblem remains centered, legible, and contained by the background plate	PASS

Caveat: the asset has not yet been rendered by the published Cursor Marketplace listing.

Steps

npm run validate
xmllint --noout plugins/wistia/assets/logo-square.svg
git diff --check