refactor(shield)!: createRule mirrors rule signature; doc + 3.0.0-beta.7

[cuzzlor]

Summary

• Breaking: createRule now mirrors graphql-shield's rule() — curried createRule(name?, options?)(fn) instead of createRule(fn, cache?). The implicit 'strict' cache default is removed; pass { cache: 'strict' } explicitly if needed.
• Strongly types parent, args, ctx (and adds info: GraphQLResolveInfo) on the inner fn via generics; return type now matches shield's boolean | string | Error.
• Add interface-level and per-property JSDoc to BaseRequestInfo in src/request-info.ts, clarifying that url is a path + query string (combine with baseUrl for the absolute URL).
• README createRule section updated for the new signature.
• Bump version 3.0.0-beta.6 → 3.0.0-beta.7.

Migration

// before
const isOwner = createRule<Ctx, Parent>((p, _, c) => p.ownerId === c.user?.id, 'contextual')

// after
const isOwner = createRule<Ctx, Parent>(undefined, { cache: 'contextual' })(
  (p, _, c) => p.ownerId === c.user?.id,
)

Test plan

• CI passes (typecheck, lint, build).
• Downstream consumers updated to the curried call form.

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