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Compare mode #135

Description

@cdelmonte-zg

From the roadmap (VISION.md, "Future: compare mode"): run the same predicate across two tables - flat vs partitioned, before vs after compaction, before vs after OPTIMIZE - and render a side-by-side report with the delta highlighted.

This is the largest new surface in the backlog and deliberately scheduled last:

  • CLI shape to design (two table arguments? --compare <path>?).
  • JSON contract implications: a comparison document is a new top-level shape, not an additive field on the single-table report.
  • Text rendering and the report viewer both need a two-column story.

No analysis semantics change: both sides run the existing pipeline; compare mode is presentation over two reports.

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