[Ontology] Reconcile lowercase and repository-case public namespace IRIs

[seonghobae]

Buyer-visible problem

LineageWeave currently has two case-distinct public namespace forms in committed artifacts:

• the knowledge-graph ontology and runtime lookup predicate use https://contextualwisdomlab.github.io/lineageweave/ontology#
• the PROV-O support profile and its contract test use https://contextualwisdomlab.github.io/LineageWeave/ontology#

GitHub Pages project paths are case-sensitive. PR #371 intentionally publishes the requested repository-case documentation endpoint without silently changing the existing semantic identifiers. That is a deployment repair, not a namespace migration.

Leaving the split undocumented long term creates a buyer-facing interoperability risk: RDF consumers may treat the two IRIs as unrelated resources even when labels and local fragments match.

Required outcome

Produce a versioned, evidence-backed namespace migration decision rather than a search-and-replace.

Inventory

• Locate every persisted, serialized, API, frontend, test, migration, example, and external-consumer use of both namespace forms.
• Include docs/ontology/lineageweave-kg.ttl, docs/ontology/prov-o-support-profile.ttl, lineageweave/ontology.py, PROV-O tests, PR feat: add bounded ontology and provenance explorer (v2.13.0) #349's ontology UI, database rows, exports, and generated Pages artifacts.
• Identify which IRIs may already exist in customer or downstream graph stores.

ADR and compatibility contract

• Choose one canonical future namespace and document why.
• Preserve the old namespace during a defined deprecation window.
• Publish a compatibility vocabulary or explicit OWL/SKOS mappings where semantically valid; do not claim owl:equivalentClass or owl:equivalentProperty without matching term kind and meaning.
• Define HTTP behavior for both old and new documentation/namespace URLs.
• Do not silently rewrite historical evidence or provenance bundles.

Migration

• Add deterministic migration tooling for stored RDF and relational identifiers.
• Keep source, generated JSON-LD/N-Triples, runtime constants, support profiles, frontend links, tests, docs, and database seeds synchronized.
• Provide rollback and idempotency evidence.
• Version public artifacts and update CHANGELOG.md/fragments.

Verification

• Exact dereference tests for both namespace forms and representative fragments.
• RDF isomorphism and term-kind tests for compatibility artifacts.
• Consumer fixtures proving old graphs still resolve and new graphs use the canonical namespace.
• No ambiguous duplicate local fragments.
• Production statement/branch coverage and public docstrings remain 100% for owned migration code.

Non-goals

• Do not block PR ci: publish the ontology through GitHub Pages #371's public documentation deployment.
• Do not rename the GitHub repository merely to avoid the semantic migration.
• Do not treat a redirect alone as proof that two RDF resources are semantically equivalent.

Dependencies

• PR ci: publish the ontology through GitHub Pages #371 establishes the deterministic public Pages pipeline and documents the current identity boundary.
• PR feat: add bounded ontology and provenance explorer (v2.13.0) #349 consumes ontology/provenance contracts in the authenticated product UI and must be included in the migration impact review.

[seonghobae]

Implementation slice is up as independent PR #492 (feat/ontology-namespace-compatibility-v2127 @ 5eb1608, ADR 0158 / v2.16.0).

Shipped: compatibility Turtle for the four matching classes, fail-closed resolver, documented HTTP 200 for both namespace documents, isomorphism/term-kind tests. Historical lowercase IRIs are not rewritten.

Not closed by #492: live Pages 200 verification, dual-path publication, and relational stored-value migration. Identity ADR remains #491 (0157, docs-only).

Independent Copilot review requested. No self-approve. Issues #79 and #87 stay open.