Resolve vs Lookup

	`POST /parts/resolve`	`POST /parts/lookup`
Input	Dirty MPN, NL, ambiguous	Known MPN
Output	candidates + confidence (+ rationale / match_hints for NL)	Single part + `part_id`
Best for	Messy or natural-language input	Exact catalog match

Use these endpoints for identity — do not scrape or reverse-engineer catalog storage.

​Resolve vs Lookup