Simulation.h/.cpp had grown a large block of schematic/unlock state
(containers, the implicit-unlock traversal, checksum folding) that has
nothing to do with tick orchestration. Split it into its own class so
Simulation stays legible as "tick orchestration + subsystem handles".
This commit only adds the new UnlockState.h/.cpp (registered in
CMakeLists.txt) with the containers, types, and logic moved in
verbatim; nothing references it yet, so this is a no-op for behavior.
Simulation is wired to use it in the next commit.
Co-Authored-By: Claude <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01YHcUerKAZKWNvSKJxYKbnG
