Famous-quote miss in library (no match should be reported)

Use the bundled sample library at ./sample-library.

A user asks for the famous quote from a famous book:

It was the best of times, it was the worst of times

Goal:

• search library content for that exact quote
• report that no book in the library contains this quote
• include brief evidence of the lookup results proving no match

Constraints:

• use library lookup tools only
• explicitly report an empty result if that is what the search returns
• do not invent a book title, author, or excerpt
• if uncertain, report no match rather than guessing