RUDPClient/openspec/changes/archive/2026-04-06-align-replay-granularity-with-live-prediction/tasks.md

1. Implementation (Already Complete)

The fixed-step replay implementation in MovementComponent.ReplayPendingInputs() is already in place using kServerSimulationStepSeconds (50ms) as the substep size.

2. Regression Tests

Note: Unity EditMode tests require Unity Editor to run.

• 2.1 Verify ReplayPendingInputs_StepByStepMatchesAccumulated_ForZeroTurnInput test passes
• 2.2 Verify ReplayPendingInputs_StepByStepDiffersFromAccumulated_ForNonZeroTurnInput test passes
• 2.3 Verify ReplayPendingInputs_NonMultipleOfCadence_HandlesRemainingDuration test passes

3. Diagnostics Capability

• 3.1 Add diagnostics exposure for acknowledged move tick, predicted pose, authoritative pose, and correction magnitude
• 3.2 Expose LastAcknowledgedMoveTick from ClientPredictionBuffer for diagnostics consumption

4. Verification

Note: Unity EditMode tests require Unity Editor. Loopback validation requires PlayMode.

• 4.1 Run all EditMode tests ensure no regression
• 4.2 Local loopback validation — controlled-player loopback movement no longer shows repeated small pull-back under steady turn-and-move input