provision
The remap bundle for a non-mojmap runtime, building the cache on first launch. Null on mojmap (dev / NeoForge production / Fabric dev), on an unsupported namespace, and on failure — which degrades this process to no-remap; the next relaunch rebuilds (an incomplete cache re-downloads).
Called once from CommonClass.init on the mcp-remap-init thread; a second call hands back what the first published rather than rebuilding.
Parameters
mcAnchor
a loaded MC class whose CodeSource is the runtime MC jar (e.g. Blocks.class)