MR-925: validation-prototypes scaffolding + exp 1.1 + exp 1.2

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- exclude validation-prototypes/ and merge-insert-cas-repro from the main
  workspace so the nested cargo workspace can use its own pin set
- add validation-prototypes/{factorized-batches,custom-lance-index}/
  scratch crates (never merged to main; long-lived branch only)
- exp 1.1 — factorized batches through DataFusion ops: writeup at
  .context/experiments/factorized-batches.md (5 cells × 8 ops; all
  scalar-keyed ops accept List<UInt64> input, UNNEST via CROSS JOIN
  fails in DF 52.5)
- exp 1.2 — custom Lance index plugin from outside lance: writeup at
  .context/experiments/custom-lance-index.md (5 probes; transaction
  surface is open, SCALAR_INDEX_PLUGIN_REGISTRY is closed → hard
  blocker for MR-737 §5.4; recommends upstream path or external-index
  path)

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Devin AI 2026-05-12 16:49:33 +00:00

parent c9c7c0672e

commit 02c4b45c85

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