refactor(mcp): decompose TokenZeroEngine impl into engine_* modules#5

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refactor/mcp-engine-decomposition

Commits on Jun 21, 2026

refactor(mcp): split TokenZeroEngine impl into focused engine modules
AdityaVG13
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refactor(mcp): shard tests.rs into tests/ submodule mirroring engine_*
AdityaVG13
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