Example client for the highly experimental divepool embedding firehose

add dids[] multi-account clustering to search client master

Mirror the new POST /api/v1/search dids[] mode: cluster a set of accounts by their precomputed topical medoids. Adds -dids (comma-separated) and -dids-file (one DID per line) flags, with the same mutual-exclusion rules as the server. parseDIDs dedupes/trims and skips blank/# lines. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>