bedrock-kv / bedrock / 09254318e1969b3cf682002923350af9e8ee34b4

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Add single-resolver fast path in commit proxy finalization

Optimize conflict resolution for the common single-resolver case by
bypassing Task.async and async_stream overhead.

Changes:
- Add ResolverLayout module with Single and Sharded struct variants
  for pattern matching in the finalization pipeline
- Implement single-resolver fast path that extracts conflict sections
  synchronously and calls the resolver directly
- Update resolve_conflicts/5 to take explicit epoch and resolver_layout
  parameters instead of extracting from opts
- Rename precomputed_layout to resolver_layout throughout codebase
- Delete LayoutOptimization module (functionality moved to ResolverLayout)
- Remove unused create_resolver_task from Batching module

The single-resolver path eliminates per-transaction Task.async spawns
and the async_stream wrapper around resolver calls, reducing overhead
for workloads that don't require sharded conflict resolution.

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