Subtle phrase match in noisy libraries

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

Goal:

• identify which book contains both phrases:
  • all that is solid melts into air
  • all that is holy is profaned
• report the book_id, exact title, and author
• include one supporting snippet and briefly explain how you verified it from library search data

Constraints:

• avoid relying on directory names as the primary signal
• prefer content search on the library before resolving a final answer
• if your search returns no hit, report that clearly instead of guessing