docs: document new search engagement operators and index migration

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Summary

Documents the May 4, 2026 search index migration announced in the changelog, including the three new precision operators and the retweet behavior change.

Changes

• Add min_likes:, min_replies:, and min_reposts: to the Search Operators reference (X API and Enterprise API) with usage guidance and examples.
• Add an Engagement operators accordion to the Search Posts introduction.
• Add a callout on the Search Posts introduction explaining that retweets are no longer returned in keyword-based search results, with pointers to alternatives (retweets_of:, retweets lookup, Filtered Stream).

Context

Sourced from the May 4, 2026 changelog entry covering the migration of /2/tweets/search/recent, /2/tweets/search/all, /2/tweets/counts/recent, and /2/tweets/counts/all to the new X core platform search index.

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