feat: expose ontology-grounded buyer relationship paths (v2.18.0)

[seonghobae]

Superseded

Closed without merge. While this isolated top-of-stack slice was being prepared, the existing #264 branch received a narrower in-stack RED→GREEN repair workflow for the same Knowledge Graph / Ontology / Buyer-surface gap. Keeping both would duplicate checks and create competing semantic implementations.

The authoritative repair is therefore continuing on #264, where the workflow currently covers:

• canonical OWL direction and inverse predicates;
• typed semantic paths with evidence/provenance;
• buyer-visible path rendering;
• analysis-run cutoff-safe navigation;
• PostgreSQL, Python, frontend, lint, build, Storybook, documentation, and release verification.

No production change from this PR was merged.

[coderabbitai]

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