Adds hs-host-to-sx to convert raw host-handle JS objects/arrays returned by json-parse or io-fetch into proper SX dicts/lists. hs-fetch now calls it on the result when format is "json". Detects host handles via absence of the internal `_type` marker, then walks Object.keys / Array items recursively. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>