better_effect 0.3.0

better_effect 0.3.0

• Added Runtime.executeWith, runWith, and runExitWith for temporary
  execution-scoped Modules.
• Execution Modules resolve local providers first and fall back to the root
  Runtime without mutating root registrations.
• Local constructor injection can combine execution-local and root services,
  including typed ServiceKey registrations.
• Execution Module resources share the managed execution Scope and remain owned
  until physical completion after timeout or interruption.
• Partial local startup failures release previously acquired resources before
  publishing an execution defect.
• Added the optional ResolverBackendOverlayFactory capability for custom
  backends; AutoInjectorBackend supports isolated overlays by default.
• Added synchronous, SDK-neutral RuntimeObserver callbacks for execution,
  service resolution, resource acquisition/release, interruption, and cleanup
  failures.
• Runtime observer failures are isolated and can be reported through a
  best-effort RuntimeObserverErrorHandler without changing Effect outcomes.
• Execution events now expose labels, physical duration, opaque Scope identity,
  logical outcomes, and selected local metadata.
• Added EffectLocal.metadata, typed EffectLocal.bind, and Effect.withLocals
  for heterogeneous batch context composition.
• Added service resolution paths, execution-scoped Module event propagation,
  Flutter Command label verification, observer-ordering tests, and a standalone
  no-observer overhead benchmark.
• Added package:better_effect/testing.dart with TestRuntime, typed Exit
  matchers/extractors, deterministic gates and signals, ordered event recording,
  Runtime event waits, and active-execution leak assertions.
• Added a public ResolverBackend compatibility kit covering lifetimes, keys,
  constructor resolution, missing/circular dependencies, duplicate and
  post-commit registration, startup cleanup, close semantics, overlays, and
  optional native disposal probes.

Full changelog: better_effect-v0.2.0...better_effect-v0.3.0