Tool-Result Context Binding

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Stamp each tool result at production time with its producing context (task/execution, tool + argument hash, authorization scope, environment digest, causal sequence, TTL); at consumption time verify the stamp and enforce the verdict - VALID / STALE / WRONG-TASK / DUPLICATE / OUT-OF-ORDER / INVALID - fail-closed for state-changing actions. Solo $9/mo, Fleet $19/mo, verdict API $0.001 per check via x402; first month free once per operator.