Reflex support

[bazyleu]

Complete full support of Reflex DI container
Resolves #99
Resolves #95

[Copilot]

Pull request overview

This PR completes the Reflex DI container integration for UniState, resolving GitHub issues #95 and #99. It refactors the existing experimental Reflex support to be production-ready (removing the experimental disclaimer from the README) and adds comprehensive test coverage mirroring what already existed for Zenject and VContainer.

Changes:

• Core extension refactoring: ReflexBuildExtensions.cs is overhauled so AddState(Type) now registers a state against all its interfaces and itself (via a new GetStateContracts helper), and state machine registration is unified through a custom ReflexStateMachineResolver that handles both transient and singleton lifetimes with proper disposable tracking.
• Full test suite: Eight new Reflex test classes are added (GoTo, GoBack, GoBackTo, Execution, BehaviorAttribute, History, Recovery, SubState), each backed by the new ReflexTestsBase helper class, matching coverage provided for Zenject and VContainer.
• README update: Removes the "experimental" warning, adds a documentation note explaining the single- vs two-parameter AddState/AddSingletonState overloads, and updates the code example to use an abstract base class instead of an interface in the two-parameter overload (reflecting the actual new intended use case).

Reviewed changes

Copilot reviewed 21 out of 21 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
README.md	Removes experimental disclaimer; adds documentation for new AddState behavior and corrects the two-parameter overload example
Assets/UniStateTests/PlayMode/UniStateTests.PlayMode.asmdef	Adds Reflex assembly reference to the PlayMode test assembly
Assets/UniStateTests/Common/TestFixture/ReflexTestsBase.cs	New base class for all Reflex tests; manages container setup/teardown and provides RunAndVerify helper
Assets/UniState/Runtime/Integrations/Reflex/ReflexBuildExtensions.cs	Core refactoring: AddState now registers all interfaces, new ReflexStateMachineResolver handles lifetime and disposable management
Assets/UniStateTests/PlayMode/GoToStateTests/GoToReflexTests.cs	New Reflex GoTo state test
Assets/UniStateTests/PlayMode/GoBackTests/GoBackReflexTests.cs	New Reflex GoBack state test
Assets/UniStateTests/PlayMode/GoBackToTests/GoBackToReflexTests.cs	New Reflex GoBackTo state test
Assets/UniStateTests/PlayMode/ExecutionTests/ExecutionReflexTests.cs	New Reflex execution lifecycle test
Assets/UniStateTests/PlayMode/BehaviorAttributeTests/BehaviorAttributeReflexTests.cs	New Reflex behavior attribute test
Assets/UniStateTests/PlayMode/HistoryTests/HistorySizeReflexTests.cs	New Reflex history size test
Assets/UniStateTests/PlayMode/RecoveryTransitionTests/RecoveryReflexTests.cs	New Reflex recovery transition test
Assets/UniStateTests/PlayMode/SubStateTests/SubStateReflexTests.cs	New Reflex sub-state test
.meta files	Unity asset tracking metadata for all new files

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