linear_write mutation allowlist via grant scope - #15
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…ia grant scope The broker's scope machinery already fails closed (a scoped grant with no registered checker denies); this registers the checker. linear_write's scopeCheck parses the mutation document's top-level fields (depth-tracked, alias-resolving, string-literal-safe) and refuses any operation outside the grant's scope.mutations list before a network call happens. Paired with the app-actor credential (she is now "Bevelina" in Linear, never the operator), the 2026-08-10 Linear incident class is closed at both ends: wrong identity is unrepresentable at the credential, and unvetted operation kinds are unrepresentable at the grant. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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Follow-up to #14: registers the scopeCheck for linear_write (top-level mutation-field parser, fail-closed) so the grant's scope.mutations list caps her Linear surface. Pairs with the new app-actor credential.
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