v0.31.0

0.31.0 (2026-08-16)

⚠ BREAKING CHANGES

• emitted extension anchors are numbered per plan, so
  plans compared byte-for-byte against output from an earlier release will
  differ. Anchors are plan-local by spec, so plan semantics are
  unaffected. ExtensionRegistry.lookup_urn and FunctionEntry.anchor
  are removed; use has_urn() / urns() for URN membership, and
  (entry.urn, str(entry)) as a function's durable identity.
  ExtensionCollector.adopt raises on an input declaring two different
  functions at one anchor, and aggregate raises on a measure that is not
  an aggregate function; both previously produced a plan with an ambiguous
  or dangling function reference.

Features

• assign extension anchors per plan, not per registry (#245) (4834cae)