fix(vest): support Vest 6

[Fasping]

Closes #872.

Vest 6 removed the vest/promisify subpath and create() now returns a Suite object instead of a callable, so the resolver breaks at module resolution and then at call time.

• use schema.run(...) with a plain await — run() returns a thenable in v6, so promisify is no longer needed
• type ICreateResult off the Suite type that v6 exports
• update the fixtures: create() no longer takes a suite name as its first argument
• spy on run instead of wrapping the suite in vi.fn, since the suite is an object now
• drop the vest/promisify UMD global from the build script

Peer range bumped to vest: ">=6.0.0": the removed subpath fails at module resolution, so a single build can't serve both v5 and v6. Happy to switch to a lazy import if you'd rather keep v5 working.

bun run test vest passes (11/11), plus lint, lint:types and build.

[github-actions]

🎉 This PR is included in version 5.8.0 🎉

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