/**
 * Z.AI Provider Media Module (DESIGN.md §9 — P3-02).
 *
 * Owns Z.AI-local media facts: accepted image and video extensions, size
 * limits, existence checks, and absolute-path resolution. Commands pass
 * raw path-or-URL strings; this module is the single owner of every
 * Provider-specific media decision for Z.AI.
 *
 * Boundary rules (ARCHITECTURE.md §2):
 *   - May import normalized errors from `lib/errors.ts`.
 *   - Must NOT read file content. The Z.AI MCP receives the validated
 *     absolute path; it never receives a data URI or file bytes from
 *     this module. Only `stat` (existence + size) is performed.
 *
 * Media rules (DESIGN.md §9 Z.AI):
 *   - Local image: JPG, JPEG, PNG (case-insensitive), at most 5 MiB.
 *   - Local video: preserve the Phase 0 extension set and 8 MiB limit.
 *   - Local source becomes an absolute path after validation.
 *   - HTTP(S) source passes through without local filesystem access.
 *   - Missing local file rejects with `FILE_ERROR`.
 *   - Non-HTTP URL-like strings and unsupported extensions reject with
 *     `VALIDATION_ERROR` and Provider-specific supported-format help.
 */
/**
 * Resolve a Z.AI image source into the value the Z.AI MCP consumes. For a
 * local file, validates existence, size (≤ 5 MiB), and extension
 * (JPG/JPEG/PNG) and returns the absolute path. For an HTTP(S) URL,
 * returns the URL unchanged without touching the local filesystem.
 */
export declare function resolveImageSource(source: string): string;
/**
 * Resolve a Z.AI video source into the value the Z.AI MCP consumes. For a
 * local file, validates existence, size (≤ 8 MiB), and extension (the
 * Phase 0 set) and returns the absolute path. For an HTTP(S) URL, returns
 * the URL unchanged.
 */
export declare function resolveVideoSource(source: string): string;
/**
 * Fetch an HTTP(S) image URL to a validated temp file path (≤ 5 MiB,
 * JPG/JPEG/PNG). Used by the vision Adapter fallback when the Provider's
 * server-side fetcher rejects a URL. The caller owns unlinking the path.
 */
export declare function fetchImageSource(url: string): Promise<string>;
/**
 * Fetch an HTTP(S) video URL to a validated temp file path (≤ 8 MiB,
 * the Phase 0 extension set). Used by the vision Adapter fallback when
 * the Provider's server-side fetcher rejects a URL. The caller owns
 * unlinking the path.
 */
export declare function fetchVideoSource(url: string): Promise<string>;
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