refactor: make v1 the canonical legacy file owner - #8020
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This was referenced Jul 27, 2026
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Part 3/12 of #7877. Depends on #8019.
This is an independently reviewable step toward the final layout demonstrated in #7979.
This PR replaces the ambiguous
previousnamespace withversions::v1. V1 now owns its reader, writer, metadata, page table, and legacy encoding implementation directly. Shared Arrow helpers move tolance-arrow, and the obsoletelance_io::encodingscompatibility namespace is removed.The change is structural: V1 wire behavior remains fixed by the fixtures introduced in the preceding PR, and current-format readers and writers are not yet reorganized here.
Validation:
cargo fmt --all -- --check