/**
 * `sema-tb` env-parsing helpers — a separate module so unit tests can import them without
 * triggering the bin's top-level `main()` (src/bin/sema-tb.ts executes on import).
 */
/**
 * Strict positive-integer env override (CC 198 seam parity: CLAUDE_CODE_MAX_CONTEXT_TOKENS /
 * CLAUDE_CODE_MAX_OUTPUT_TOKENS are the same shape). Unset OR set-but-blank ⇒ undefined (blank is
 * how shells "unset" exported vars, so it must behave exactly like absent). A set-but-invalid
 * value (non-digits, zero, unsafe magnitude) is IGNORED with a stderr warning so a typo'd leg
 * degrades to the anchored provider defaults instead of poisoning the model spec.
 */
export declare function positiveIntFromEnv(name: string, env?: NodeJS.ProcessEnv): number | undefined;
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