- TMDO_Cache_Layer::flush_group() bumps the post type's cold cache version
(option wpdo_cold_cache_version) instead of wp_cache_flush_group(), which
Redis Object Cache runs as one server-side scan that blocks Redis on a large
group; entries under older keys expire by their TTL
- TMDO_Zone_Cold::cache_key() builds every cold blob key; version 0 keeps the
current keys, so upgrading invalidates nothing
- Verify: CacheLayerTest (new keys, no scan, other post types untouched),
unit 702, integration 583, phpcs, stan
- PR: PR-110
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