feat: P2 EarlyHint callback channel for cost gating#882
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Add optional onEarlyHint callback for internal cost gating before verify stage. - EarlyHint type: version, stage, continue, reason, confidence, candidate? - 3 emit points: explore (viable/not), synthesize (candidate/not), cascade (auth/ok) - candidate only on synthesize/cascade + continue:true (not on stop or explore) - unsupported-required-args goes directly to P1 terminal, no P2 hint emitted - 6 new tests covering all hint paths + guardrails
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Summary
EarlyHinttype and optionalonEarlyHintcallback toGenerateVerifiedOptionsGenerateOutcometerminal contractDesign
continue: truehints carrystage + confidence + candidate?(candidate only on synthesize/cascade)continue: falsehints immediately followed by existing P1 terminal returnunsupported-required-argsgoes directly to P1 — no P2 hint emitted (guardrail)Test plan
tsc --noEmitclean