bedrock-kv / bedrock / 5988529deb506225ca4a305575fbd60265292eb9

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Implement system metadata mutation distribution via resolver (#64)

Add infrastructure for distributing system metadata mutations (keys with
\xFF prefix) through the resolver to commit proxies. This enables
proxies to receive differential metadata updates during conflict
resolution.

Changes:
- Add metadata_mutation?/1 helper to Transaction module
- Create MetadataAccumulator for version-ordered metadata window storage
with O(1) append using reversed internal list
- Extend Resolver state with proxy_progress tracking and metadata_window
- Update Resolver server to accumulate committed metadata and return
differential updates based on proxy progress
- Update Resolver public API to accept metadata_per_tx and return
metadata_updates
- Integrate metadata flow in commit proxy finalization pipeline
- Add metadata state to commit proxy server with async update handling

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