/**
 * legacy-cost-hooks migration: re-install cost hooks that predate the shim.
 *
 * Replaces `stale-cost-hooks` (cost-capture-goes-dark/AC-14, AC-18). That
 * migration asked "does the absolute CLI path recorded in the hook still exist?"
 * — the right question only while the command *contained* an absolute path. Hook
 * commands now invoke `.aidlc/cost/capture.sh`, which resolves node and the CLI
 * at run time, so there is no longer a path that can go stale and nothing left
 * to detect. What remains is a one-time migration: hooks installed by an older
 * version still carry the frozen paths and are still silently broken.
 *
 * WHY THIS ONE REPAIRS, WHERE ITS PREDECESSOR ONLY REPORTED. `stale-cost-hooks`
 * was deliberately report-only, reasoning that "a diagnostic must not silently
 * rewrite a user's .claude/settings.json". That reasoning was sound and is
 * narrowed here rather than discarded: this migration only ever replaces hook
 * entries carrying our own `#aidlc-cost-hook` marker, via the same
 * merge-not-clobber installer that leaves every other key and every unmarked
 * hook untouched. Nothing the user wrote is rewritten.
 *
 * The reason to change the stance at all is what report-only cost us: the
 * detection was correct, the report printed on every `aidlc update`, and the
 * data was lost anyway, because the last link in the chain was a human reading a
 * line. A repair that needs to be noticed is a repair that does not happen. The
 * failure it prevents is silent and unrecoverable — usage that was never
 * captured cannot be reconstructed later.
 *
 * Self-clearing: re-installing produces the shim form, so `legacy` goes false
 * and this stops reporting without anyone editing state.
 */
import type { Migration } from '../types.js';
/**
 * Platforms whose installed hook still uses the pre-shim absolute-path form.
 * Read-only half, exported for reuse and direct testing.
 *
 * Only installed hooks are considered: an absent hook is a different condition
 * (never armed, not broken), and `aidlc cost hooks status` already says so.
 */
export declare function legacyCostHookPlatforms(projectRoot: string): string[];
export declare const legacyCostHooks: Migration;
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