bedrock-kv / bedrock / 365331e9902e8e857be4c7ae5c2ed2a469d4c715-PR-65

Pull #65

github

Add Demux service for per-shard transaction distribution

Implements the Demux system that receives committed transactions from Log,
slices mutations by shard using SHARD_INDEX, and routes to per-shard
ShardServers for buffering and ObjectStorage persistence.

Key components:
- MutationSlicer: Extracts per-shard slices from transactions
- Durability: Tracks min durable version across shards using gb_sets
- ShardServer: Per-shard GenServer with buffer, flush, and long-pull API
- Server: Coordinator that routes transactions and tracks durability
- Supervisor: one_for_all supervision for consistency on crash

Also extends WaitingList with remove_all_less_than/2 for range-match
semantics needed by ShardServer long-pull notifications.

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