Joins

[fogelito]

Summary by CodeRabbit

• New Features

  • Join support (inner/left/right) with aliasing and relation-based comparisons.
  • QueryContext introduced to carry selections, permissions, and tenant scope across operations.

• Behavior Changes / Refactor

  • Selection semantics switched to per-field selects; projections and internal field exposure adjusted.
  • Core read/query flows moved to context-driven processing; validators reworked (new V2 validator) and many legacy validators disabled.

• Tests

  • Expanded join end-to-end coverage; tests updated to use QueryContext and per-field selects.

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