RUDPFramework/openspec/changes/archive/2026-04-06-add-jitter-regression-coverage/proposal.md

Why

Steps 1-3 fixed the core timing issues but jitter persists. Step 5 adds deterministic regression coverage so the remaining jitter path has verifiable, reproducible tests — making future debugging faster and preventing regressions.

What Changes

• Add a regression test confirming live prediction and replay produce identical trajectories for non-zero turn input (fills gap between existing zero-turn test and the spec requirement).
• Add regression test for ClientPredictionBuffer acknowledged-move-tick exposure per client-prediction-diagnostics spec.
• Add regression test confirming the MainUI diagnostic handlers receive correct correction magnitude values.
• All new tests are in SyncStrategyTests.cs alongside existing prediction tests.

Capabilities

New Capabilities

• (none — this is a test coverage step)

Modified Capabilities

• (none)

Impact

• Assets/Tests/EditMode/Network/SyncStrategyTests.cs — new test methods added
• No production code changes