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### What problem does this PR solve? Fixes Infinity-specific API regressions: preserves ```important_kwd``` round‑trip for ```[""]```, restores required highlight key in retrieval responses, and enforces Infinity guards for unsupported ```parser_id=tag``` and pagerank in ```/v1/kb/update```. Also removes a slow/buggy pandas row-wise apply that was throwing ```ValueError``` and causing flakiness. ### Type of change - [x] Bug Fix (non-breaking change which fixes an issue)