Release a funded private task allocation

Request deletion of the exact funded allocation. Cleanup remains authorized by state-management access after pause, task expiry or work-grant revocation. Observed allocations require positive observation followed by provider absence; unknown usage stays held. An expired plan with no allocation intent can instead publish an atomic never-dispatched proof, zero usage and original-day/task balance refund. Once any allocation intent exists, missing resources or provider refusal cannot authorize this zero settlement. Trusted Activity data only; never put machine identity or private pins in Workflow payloads.