New crate v2/crates/homecore/ — DashMap state machine, tokio
broadcast event bus, service registry (direct-dispatch P1),
in-memory entity registry, HA-compat wire constants.
20/20 unit tests pass. EntityId rejects unicode per ADR-127 Q1
(ASCII strict P1). State machine suppresses no-op writes,
preserves last_changed on attribute-only updates, fires
state_changed broadcast for every real write.
Critical path foundation — ADR-130 (API) and ADR-128 (plugins)
can begin P1 once this is in main.
Refs: docs/adr/ADR-127-homecore-state-machine-rust.md
Refs: #798
Co-Authored-By: claude-flow <ruv@ruv.net>
a52e046143