feat: add partitioned context namespace helper#94
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lance-format#90) Proposes scoped isolation via a Lance Partitioned Namespace over the single ContextRecord schema, rather than table families + an information_schema. Aligns with maintainer guidance on lance-format#37: one schema to maintain, many physically isolated partitions, optional unified cross-partition view, and the __manifest table as the registry (no DB/catalog we own). Covers: partition-vs-record dimension placement, recommended partition specs and naming/URI conventions, a thin (catalog-free) ContextNamespace helper sketch, when-to-partition guidance, migration and partition-spec evolution, interaction with existing features, alternatives, and a docs-first phased rollout mapped to the lance-format#90 acceptance criteria. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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Summary
Fixes #90
Testing
Note: local Rust checks required PROTOC and PROTOC_INCLUDE to point at the Python environment's protoc/grpc include paths.