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Adds to Core:
  • Lockstep time model with the on_tick policy, staging, initial observations, multi-tick advances, and declared tick authority — AWP-TIM-002..004, AWP-TIM-009..012
  • Seeding, snapshot/restore, deterministic replay — AWP-REP-001..003
  • Sim-time timestamps (ts_sim_ns, tick) in the frame extension block — AWP-CLK-003, AWP-DAT-007
  • world.reset: the manifest MUST list at least one entry in initial_states, and world.reset { initial_state } MUST return the world to that named state (with seed when capabilities.seed is advertised) with the cross-session effects of AWP-PRM-006. [AWP-SIM-001]
Intended for: RL/eval harnesses, game-logic testbeds, digital twins in analysis mode. The planned gymnasium-bridge targets this profile for environments that support snapshot/restore (picklable state); other environments can claim Core only.