refactor: move file-version selectors to lance-file - #8026
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Part 9/12 of #7877. Depends on #8025.
This is an independently reviewable step toward the final layout demonstrated in #7979.
StableandNextare file-writing selectors, not encoding mechanisms. This PR movesLanceFileVersionand selector resolution fromlance-encodingtolance-file, leavingConcreteFileVersionas the exact identity consumed below that boundary.This step deliberately preserves the existing selector API and transitional conversions so the ownership move compiles independently. Dataset operation policy is migrated in part 10, and part 11 removes the remaining index-boundary conversions, ordering, and implicit exact/selector conversions.
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