/**
 * Spectral Vision Extension
 *
 * Converts attached images into text analysis before the main agent call.
 *
 * Pipeline (only active when the main model cannot process images natively):
 *   - Use the admin-configured default vision model.
 *   - Otherwise use the best available authenticated image-capable model.
 *   - Replace image blocks with the text analysis before persistence when
 *     possible (`message_end`), so image data is deleted from conversation
 *     history and is not re-analyzed on later turns.
 *   - Keep a `context` hook as a defense-in-depth fallback for older sessions
 *     or messages that entered context before the replacement hook existed.
 */
import type { ExtensionAPI } from "../sdk/coding-agent/index.js";
export default function spectralVisionExtension(ext: ExtensionAPI): void;
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