/**
 * Write-path health check.
 *
 * Verifies that (a) the resolved storage tier matches the presence of Supabase
 * credentials and (b) the tables the WRITE path resolves to actually exist on
 * the configured backend. Surfaces two silent-failure classes loudly at
 * startup instead of on the first failed write:
 *
 *   1. free_with_credentials — Supabase creds are present but the tier resolved
 *      to FREE (e.g. an invalid/expired/placeholder GITMEM_API_KEY). Writes go
 *      to local .gitmem/ files instead of Supabase, while reads (recall,
 *      cache-health) can still reach Supabase and mask the problem.
 *   2. missing_tables — pro/dev tier, but the prefixed tables don't exist (e.g.
 *      a GITMEM_TABLE_PREFIX mismatch, or the schema was never applied).
 *      create_learning / create_decision 404 (PGRST205) on the first write.
 *
 * Fire-and-forget: never throws (whole body is guarded), never blocks startup.
 * Logs a loud warning to stderr when misconfigured, a one-line confirmation
 * otherwise.
 */
export type WritePathMode = "local" | "free_with_credentials" | "missing_tables" | "supabase" | "skipped";
export interface WritePathResult {
    ok: boolean;
    mode: WritePathMode;
    missing?: string[];
}
export declare function checkWritePath(): Promise<WritePathResult>;
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