- Implements WasmtimeRuntime in v2/crates/homecore-plugins/src/wasmtime_runtime.rs
with a Wasmtime 25 Cranelift JIT engine. Registers 4 host imports via Linker:
hc_state_get, hc_state_set, hc_state_subscribe, hc_log. Each plugin gets an
isolated Store<PluginStoreData> holding a HomeCore handle + subscription list.
- Adds host_abi.rs documenting the JSON-over-linear-memory wire format (public
ABI spec for plugin authors). Max buffer 64 KiB. ConfigEntryJson and
StateChangedEventJson are the canonical wire types.
- Creates v2/crates/homecore-plugin-example/ (wasm32-unknown-unknown, excluded
from workspace per wifi-densepose-wasm-edge pattern). The plugin monitors
sensor.test_temp and sets binary_sensor.test_alert on/off at 25/20 thresholds.
- Adds tests/integration.rs with 3 tests: compiled .wasm end-to-end round-trip,
WAT-based fallback (always runs), and linker smoke test. All 15 tests pass
(12 unit + 3 integration) under --features wasmtime.
- ADR-128 Q2 resolved: Wasmtime is the chosen runtime for P2. WASM3 stays as
future fallback under --features wasm3 for constrained hardware (ADR-128 §8).
Co-Authored-By: claude-flow <ruv@ruv.net>
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