Trust agreement v4.1

Stronger protection against a "merger" challenge. For the common setup where the owner is also the trustee, the agreement now recognizes a broader class of beneficial interest holders, including future token holders and secured parties, and adds a springing Continuity Trustee that activates only if a court ever finds the trust collapsed. This preserves the trust with no dependency on Fabrica and without changing the owner's tax pass-through treatment, which matters to current owners, future buyers, and lenders relying on the structure.