fix(net): harden sync message resource controls - #6966
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Peer-derived sync state could bypass height validation, request rate limiting, and block-fetch deduplication at boundary conditions. Reject invalid remain counts and overflowed heights, apply sync-chain rate limiting to every request, and size the block ID cache to cover the full valid fetch window.
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What does this PR do?
Peer-derived sync state could bypass height validation, request rate limiting, and block-fetch deduplication at boundary conditions.
Reject invalid remain counts and overflowed heights, apply sync-chain rate limiting to every request, and size the block ID cache to cover the full valid fetch window.
Fixes #6942
Why are these changes required?
This PR has been tested by:
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