/**
 * Canonical AIFight home root. Default `~/.aifight`, overridable via
 * `AIFIGHT_HOME`. Both the CLI and the desktop app resolve EVERY config
 * path from here, so they always share one config folder. Tests set
 * `AIFIGHT_HOME` to a temp dir to isolate from real user data.
 */
export declare function getAifightHome(): string;
export declare function getRuntimeHome(): string;
/** Root of all agent profiles: `<aifight-home>/agents`. */
export declare function getAgentsRoot(): string;
/**
 * Sanitize one untrusted value (agent slug, agent id, session id, …) into a
 * filesystem-safe path SEGMENT: replace every character outside
 * [A-Za-z0-9._-] with "_", cap at 128 chars, and never return an empty string
 * (fall back to "unknown"). This neutralizes "/", "\\", ":" and absolute-path
 * prefixes, so a caller that joins the result under a known root cannot be
 * walked out of that root by a single segment. A pure-dots value like ".."
 * survives (dots are allowed), so callers that build a full path MUST still
 * assert containment against their root as defense-in-depth — see
 * resolveAgentDir in profile/profile-loader.ts.
 */
export declare function safePathSegment(value: string): string;
export declare function getDefaultDbPath(): string;
export declare function ensureRuntimeHome(): void;