feat(engine): Synchronous task queue

[clabby]

Overview

Note

WIP, fleshing out with the actor + block building task in child branches

Refactors the engine tasks into a new format that can be processed by a synchronous task queue. In this model, engine tasks are considered atomic over the EngineState, guaranteeing tasks have exclusive access of the local engine state during execution.

Higher up, the engine actor will use this queue to synchronously execute engine events in-order, and can serve the other actors asynchronous copies of the EngineState rather than sharing it with a lock.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 34 lines in your changes missing coverage. Please review.

Project coverage is 92.0%. Comparing base (ebfe85f) to head (e4c0ff2).
Report is 7 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
crates/protocol/protocol/src/block.rs	0.0%	34 Missing ⚠️

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