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Update merge protocol & various improvements for production stability (#188)

Base-KV improvements:
Loosens the merge prerequisite on config alignment, enhances the RedundantRangeRemovalBalancer to detect and purge zombie ranges, refactors the local engine for pluggability, and rolls out multiple optimizations—snapshot session reuse, obsolete snapshot filtering, leaner installation flow, lower split/merge memory pressure, faster distributed range lookup, RocksDB internal metrics toggles, redefined WAL compaction thresholds, improved WAL read path, and better default local-engine settings—alongside pluggable split hinters.

Inbox service optimizations:
Cuts read/write overhead in InboxStoreCoProc and accelerates BatchInsertRequest marshalling.

Multi-tenancy enhancements:
Adds tenant-level observability metrics and introduces a tenant-level switch to publish will messages during shutdown.

Bug fixes:
Resolves a NoSuchElementException when parsing AgentMetadata from CRDT and eliminates task duplication in BatchQueryCall.

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