[Bug]: FormatRegistry thread safety documented but not enforced

[Splatcrafter]

AI REVIEWED

Module: cli
File: cli/format/FormatRegistry.java (~line 62-65)
Severity: Medium

Summary

Documentation warns that register() is not synchronized, but no enforcement prevents concurrent registration. Uses LinkedHashMap which is not thread-safe.

Suggested Fix

Either:

1. Use ConcurrentHashMap and synchronize register()
2. Freeze after initialization (like the core registries)
3. Throw exception if registration attempted after first get() call