Clean up standalone save/persistence review noise

[MhaWay]

Summary

This is a cleanup-only follow-up for the standalone save/persistence work already merged in 0dea755.

The goal is to reduce review noise around that code so the remaining logic is easier to read.

Changes

• removed leftover commented-out reload cache code in SaveLoad and wired the existing cache handoff back in
• cleaned up a small formatting issue in ConstantTicker
• clarified the VTR sync comment
• resolved two simple server-side TODOs by clamping chat length and gating direct debug handling behind dev mode
• added focused tests for the debug gate behavior

Validation

• dotnet test Tests --filter StandaloneMapStreamingTest
• dotnet build Client\Multiplayer.csproj

[Copilot]

Pull request overview

This PR cleans up follow-up noise around standalone save/persistence and tightens a couple of server-side behaviors without changing the broader architecture.

Changes:

• Re-enabled cache handoff during save/reload and removed leftover commented-out code.
• Added server-side chat length clamping and dev-mode gating for debug packets.
• Clarified comments/formatting and added focused debug-gate tests.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
Source/Tests/StandaloneMapStreamingTest.cs	Adds tests for debug packet behavior with dev mode disabled/enabled.
Source/Common/Networking/State/ServerPlayingState.cs	Clamps chat messages and rejects debug handling when dev mode is unavailable.
Source/Client/Saving/SaveLoad.cs	Restores cache handoff assignments during save/reload.
Source/Client/Patches/VTRSyncPatch.cs	Clarifies the synchronized VTR update-rate comment.
Source/Client/ConstantTicker.cs	Adjusts autosave branch formatting.

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