singleton-registry 2.1.1

Thread-safe singleton registry for Rust with isolated, per-type storage — powers the JigsawFlow microkernel pattern
Documentation 
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# Porting singleton-registry to Other Languages

This guidance has been consolidated into the JigsawFlow implementation plan.

See: **[JigsawFlow PLAN.md — Section 2 (Core Semantics) and Section 11 (Cross-Language Reference)](https://github.com/dominikj111/JigsawFlow/blob/main/PLAN.md)**

That document covers the language-agnostic API surface, token design by language, thread safety by language, reference counting by language, and performance considerations for all ports (Rust, C++, TypeScript, ...).