Function normalizeFailureSignature

src/skills/learning/failures.ts:40–52

(tool: string, error: string)

 * and hex; lowercase; collapse whitespace; cap length. Keyed by the tool name.
 */
export function normalizeFailureSignature(tool: string, error: string): string {
  let s = (error || '').toLowerCase();
  s = s.replace(/[\w./-]*\/[\w./-]+/g, '<path>');     // unix-ish paths (with a slash)
  s = s.replace(/[a-z]:\\[\w\\./-]+/g, '<path>');      // windows paths
  s = s.replace(/\b[\w-]+\.[a-z][a-z0-9]{0,5}\b/g, '<path>'); // bare filenames (x.ts, y.py)
  s = s.replace(/:\d+(:\d+)?/g, '');                   // :line:col
  s = s.replace(/'[^']*'|"[^"]*"|`[^`]*`/g, "'<id>'"); // quoted identifiers
  s = s.replace(/\b0x[0-9a-f]+\b/g, '<hex>');
  s = s.replace(/\b\d+\b/g, '<n>');
  s = s.replace(/\s+/g, ' ').trim();
  s = s.slice(0, 100);
  return `${tool}|${s}`;
}

/** A short, stable key for a task (so we count distinct tasks). */
export function taskKey(prompt: string): string {