freeeve / tinykvs / 21083691545

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feat: interactive shell, aggregations, and batch operations

Interactive Shell:
- SQL-like query language (SELECT, WHERE, ORDER BY, LIMIT)
- Aggregation functions: COUNT, SUM, AVG, MIN, MAX
- Support for nested field access (e.g., payment.amount)
- Tab completion and history

Batch Operations:
- WriteBatch for atomic multi-key writes
- PutIfNotExists (insert only if key doesnt exist)
- PutIfEquals (compare-and-swap)
- Increment (atomic counter updates)
- DeleteRange and DeletePrefix

Code Organization:
- Split store.go into batch.go, query.go, convenience.go
- Split store_test.go into focused test files
- Applied gofmt -s simplifications

API Additions:
- Store.Count, Sum, Avg, Min, Max, Aggregate methods
- Programmatic access to aggregation queries
- Batch.PutMap, PutStruct, PutJson helpers

Performance:
- Direct msgpack serialization for maps (2.5x faster PutMap)
- Reduced allocations in struct serialization

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4294 of 6828 relevant lines covered (62.89%)

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