Add Python/CLI parity utilities for ordinal pair evidence

[Fieldnote-Echo]

Context

ordgraph-proto/scripts/probe_smoke.py and parts of probe_query_doc.py duplicate ordinal kernel logic in Python:

• rank bucketization
• contingency table construction
• RankQuant symmetric score
• band agreement
• top-group overlap
• bucket L1 distance
• coarsened/quantized contingency projections

That logic belongs with ordvec so probes and downstream harnesses do not fork kernel semantics.

Acceptance criteria

• Add Python and/or CLI utilities that emit the same pair-evidence projections currently used by OrdGraph probes.
• Include golden/parity fixtures against current ordgraph-proto probe output.
• Support clean downstream use by OrdGraph and OrdinalDB eval harnesses.
• Keep corpus-specific logic out of ordvec; this should be kernel/projection generation only.

Non-goals

• No graph/event/falsifier semantics in ordvec.
• No arXiv/enterprise fixture ownership in ordvec.

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Draft source: /home/ndspence/Downloads/ordgraph_extraction_issue_queue.md