Track down the NodeNorm Biolink type changes on exp

[gaurav]

uv run pytest --target exp tests/nodenorm/test_nodenorm_types.py fails because the position of biolink:OntologyClass has changed. This PR makes those failures legible and records what actually changed, so we can decide whether to accept the new values as the baseline or fix NodeNorm.

1. Report every difference at once

Each of the four tests looped over its CURIEs and asserted per-CURIE, so the first mismatch aborted the test and hid the rest — tracking down the change meant fixing one expectation at a time to reveal the next.

The four near-identical request/compare blocks are now one check_biolink_types() helper that collects every mismatch across every CURIE into a single assertion, and distinguishes a membership change (calling out which types are missing and which are unexpected) from a pure reordering:

4 difference(s) found:

MESH:D014867: Biolink types differ (reordered only)
  expected: [...]
  actual:   [...]
  missing from actual: []
  unexpected in actual: []

NCIT:C34373: Biolink types differ (membership differs)
  ...
  unexpected in actual: ['biolink:OntologyClass']

That commit is behaviour-preserving — no expected values change.

2. What changed on exp

Three differences, all consistent with a Biolink model version bump rather than a change in Babel's data:

#	Change	Affected CURIEs
1	biolink:OntologyClass now returned where it previously wasn't, inserted after the second-most-specific type	MESH:D014867 (SmallMolecule), NCIT:C34373 (Disease) — but not UNII:K16AIQ8CTM (ChemicalEntity)
2	biolink:GeneOrGeneProductOrGeneFamily is a new type on gene cliques, directly after biolink:GeneOrGeneProduct	NCBIGene:22059, PR:Q9Y6J0
3	biolink:OntologyClass moves from index 10 to index 2 under DrugChemical conflation	MESH:D014867

(3) is the change that prompted this investigation, and it falls out of (1): OntologyClass now arrives with the main clique's types instead of being appended by the conflation tail. Membership is identical; only the order differs.

Questions for review

• Is (1) intended? The inconsistency is suspicious: MESH:D014867 and NCIT:C34373 gained OntologyClass, but UNII:K16AIQ8CTM did not.
• Is (2) simply a new class in the Biolink model we should accept?
• Do we care about (3) at all, given the type set is unchanged? If ordering is only meaningful for the first (most specific) type, these tests may be over-asserting.

Note on other targets

The expectations now match exp only. dev, prod, test and ci still return the previous baseline and so now fail with the exact inverse differences. That is deliberate — making the tests pass on every target would need version-conditional expectations that hide the very difference we're trying to decide on. Once exp is promoted, this should go green everywhere; if we'd rather stay on the old baseline until then, the second commit can simply be reverted.

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