import type { ExtensionContext } from "@earendil-works/pi-coding-agent";
import type { FabricCacheObservation, FabricCacheSample } from "./types.js";
export declare const CACHE_OBSERVATION_LIMIT = 256;
/** Unknown counters are not zero-percent cache misses. */
export declare function cacheSample(usage: unknown, entryId: string, timestamp: string): FabricCacheSample | null;
/** Bounded active-branch walk; never scans session files or abandoned branches. */
export declare function observePromptCache(context: ExtensionContext): FabricCacheObservation;
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