Lossless zlib halves the size; loaded tiles are exact; corrupt/stale files are rejected and
regenerated; zero cost when off. Code is on wip/l16-tile-cache until it is made Windows-safe.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CSFYgsdW8ejZSyiMf4qRSX