v0.6.0 of lazily

Lazy reactive primitives for Dart — Slots, Cells, and Signals with automatic dependency tracking and cache invalidation, plus the lazily-spec wire protocol for mirroring graph state across processes a [...] Changelog excerpt: Full feature-parity release: every feature row in the lazily-spec cross-language coverage matrix that can run on the Dart platform is now shipped (✅). Dart moves from ~/—to ✅on 13 rows— the reactive core, all CRDT collection types, the distributed plane, signaling, state projection, causal receipts, and instrumentation. The only —remaining is Thread-safe context— a legitimate Dart carve-out per the spec (Dart isolates are a process/actor-isolation model with no shared address [...]