feat(optimization): run-scoped usage, budget, and cancellation contracts (RFC #6357, PR 1/2)#6358

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caohy1988:feat/optimization-run-context

Commits on Jul 10, 2026

feat(optimization): add run-scoped usage, budget, and cancellation contracts (OptimizationRunContext, OptimizerCapabilities, terminal_status)
caohy1988
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align contracts with revised RFC: call/run status split, indeterminate token compliance, granular capabilities, OptimizerResult unchanged
caohy1988
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harden contracts per adversarial review: terminal state machine, frozen ledger, provider-failure precedence, independent type-cleanliness
caohy1988
committed