Function fileFreshness

src/context/episodic-memory.ts:89–92

(files: string[], exists: (f: string) => boolean)

/** Fraction of an episode's touched files that still exist (1 when none recorded — nothing to judge). */
export function fileFreshness(files: string[], exists: (f: string) => boolean): number {
  if (files.length === 0) return 1;
  return files.filter(exists).length / files.length;
}

/**
 * Rank episodes against a query by lexical similarity (prompt + summary), then select a