Description:
If a team member wants to sell their unvested allocation OTC (Over-The-Counter), they should be able to transfer ownership of the vault to another wallet. This should be an opt-in feature determined by the Admin.
Acceptance Criteria:
[ ] Add is_transferable boolean flag to the vault configuration.
[ ] Implement transfer_vault(vault_id, new_beneficiary).
[ ] Revert with "Vault is non-transferable" if the flag is false.
Labels: feature, defi