/**
 * # session/sizing — the cockpit's bounded-risk sizing + budget envelopes
 *
 * The two pure projections the Simulate driver ({@link import("./simulate.ts")}) layers onto the wake
 * kernel so a model sizes WITHIN the bounded-risk envelope instead of into a silent fire-time clamp:
 *  - {@link sizingHeadroomOf} — the MAX fillable size the remaining-R budget admits for the exec
 *    instrument, charged at the FULL COST BASIS (ADR-0017: equity `spot × mult`, option `premium × mult`);
 *  - {@link budgetEnvelopeOf} — the remaining-R fraction + the nested plan ⊆ book ⊆ owner envelopes,
 *    carrying the optional {@link SizingHeadroom} when the caller can source the exec price.
 *
 * PURE: derivations of the injected budget + price, no wall clock / RNG. Both fail closed — an
 * unbuildable basis (no live price, a non-finite premium) yields a `null` cap + a note of the cost-basis
 * rule, never a fabricated per-leg number.
 */
import type { Budget, BudgetEnvelope, SizingHeadroom } from "../frame/types.ts";
/** The **sizing headroom** (kestrel-m9i.32) — the MAX fillable size the remaining-R budget admits for
 * the exec instrument, so a model sizes WITHIN the bounded-risk envelope instead of into a SILENT
 * fire-time clamp. Bounded risk is the FULL COST BASIS (ADR-0017): equity charges `qty × spot × mult`
 * (mult 1), an option `qty × premium × mult` — so `maxUnits = floor(remainingUsd / basisPerUnit)`.
 *
 * Equity/spot (`multiplier === 1`): the per-share basis IS the spot; when spot is a live finite price
 * the cue is concrete. Option (`multiplier !== 1`): the basis is `premium × mult`; when a near-money
 * `optionPremium` is supplied the cue is concrete, otherwise the basis is unbuildable — the model
 * still gets the remaining-$ ceiling + a note of the cost-basis rule (never a fabricated per-leg cap).
 * PURE: a derivation of the injected budget + price, no wall clock / RNG. */
export declare function sizingHeadroomOf(args: {
    readonly instrument: string;
    readonly remainingUsd: number | null;
    readonly spot: number | null;
    readonly multiplier: number;
    readonly optionPremium?: number | null;
}): SizingHeadroom;
/** The cockpit risk-envelope budget (remaining-R + the nested plan ⊆ book ⊆ owner envelopes) from
 * the plan-lifecycle {@link Budget}. `remainingR` is the fraction of the session's 1R still uncommitted
 * (`remaining / total`); the three envelopes are the session's 1R (rUsd IS 1R — a structural config
 * fact, not an invented value). Carries the optional {@link SizingHeadroom} (the max fillable size the
 * remaining-R budget admits) when the caller can source the exec price. Pure. */
export declare function budgetEnvelopeOf(budget: Budget | null | undefined, sizing?: SizingHeadroom | null): BudgetEnvelope;
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