feat(micromax): implement fail-safe state machine and C++ HAL

[riteshrajas]

This PR updates the MicroMax submodule to implement a high-reliability, multi-board Hardware Abstraction Layer (HAL) as per the APEX Tiered Node Expansion plan.

Changes include:

• A RESEARCH.md documenting HAL patterns for Arduino/C++.
• Core HAL interfaces (IActuator.h, ActuatorRegistry.h).
• A deterministic Fail-Safe State Machine (FailSafeStateMachine.cpp/h) that reverts to safe states upon host heartbeat timeout.
• Standardized Communication.cpp logic to support basic ASP v2.0 JSON parsing.
• Unit tests (test_main.cpp) verifying parser and state transitions.

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PR created automatically by Jules for task 10081917100928509036 started by @riteshrajas

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