P3-30 Unify simulation clock across Unity/CoreSim/NativeEngine

[Kinin-Code-Offical]

(Synced from docs/current_status/issue_ready_backlog.md)\n\n# P3-30 Unify simulation clock across Unity/CoreSim/NativeEngine\n\nSummary

• Area: architecture
• Deliverable: explicit time contract for multi-rate stepping + latch rules.

Acceptance Criteria

• Time contract is documented.
• Systems follow it or clearly mark deviations.

Test Plan

• Trace: compare time series of steps across systems and ensure alignment.

Likely File Targets

• Cross-cutting docs + stepping orchestrators

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[github-actions]

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