Get business posts

Get Google Business posts / updates for a Maps place.

Approach: searches the Google SERP for the business by ludocid (derived from the data_id's low hex part) and parses the knowledge panel's data-attrid="kc:/local:any posts" and kc:/local:merchant_description sections. This is the same data surface and other SERP-based scrapers use.

The Maps protobuf endpoints (localposts, batchexecute Qt4aBe) return empty for virtually all businesses even when they have posts in the knowledge panel — Google deprecated those endpoints in favor of the SERP knowledge panel.

Requires data_id (0x...:0x...), available from /maps/search results.