chore: normalize lowercase metpo: CURIE prefix to uppercase METPO:

[turbomam]

Closes the gap between the blessed prefix decision (#16) and the hand-authored source: the CURIE prefix should be uppercase METPO: over the lowercase URI path https://w3id.org/metpo/ (matches bioregistry preferred_prefix: METPO, README.md, metpo-odk.yaml, metpo-idranges.owl).

Normalizes metpo: -> METPO: in 9 RDF/SPARQL/doc files (prefix bindings and usages flipped together, so resolution is unchanged), plus adds a CI guard.

One change affects emitted output, called out for review: sparql/bacdive_oxygen_phenotype_mappings.rq builds a display CURIE; its BIND(... "metpo:" ...) becomes "METPO:", so the ?metpo_curie column is now emitted in canonical case.

New guard tests/check_curie_prefix_case.sh + curie-prefix-case.yml workflow fails on a lowercase metpo: CURIE prefix in tracked .ttl/.rq/.sparql/.md. Its regex ignores non-CURIE metpo: (Make targets like load-metpo:, YAML keys, Python names). Verified locally: passes clean, catches a planted violation, ignores the false positives.

Deliberately out of scope:

• Generated release artifacts (metpo.obo/-base/-full, .owl) still carry lowercase idspace: metpo; that needs a generator fix + rebuild and is tracked in Generated .obo artifacts emit lowercase idspace: metpo instead of the blessed METPO prefix #557 (so the guard does not scan them).
• external/metpo_historical/*.owl are frozen archival BioPortal submissions, left as-is.
• A synthetic metpo:<filename> placeholder id in analyze_metpo_grounding.py is an internal analysis id, not an ontology term CURIE, so it is left as-is and outside the guard's RDF/query/doc scope.

[Copilot]

Pull request overview

Normalizes the METPO CURIE prefix casing across hand-authored RDF/SPARQL/docs to consistently use uppercase METPO: (while keeping the namespace IRI https://w3id.org/metpo/ lowercase), and adds CI enforcement to prevent reintroducing lowercase metpo: CURIE prefixes.

Changes:

• Replace metpo: CURIE prefix bindings/usages with METPO: across affected .ttl, .rq/.sparql, and .md sources.
• Update one SPARQL query’s emitted display CURIE to the canonical uppercase form ("METPO:").
• Add a repo guard script plus a dedicated GitHub Actions workflow to fail PRs that reintroduce lowercase metpo: CURIE prefixes in tracked RDF/SPARQL/doc file types.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
tests/sparql_qc/qc-positive-fixture.ttl	Updates fixture data to use METPO: and adds clarifying fixture-only comment.
tests/check_curie_prefix_case.sh	Adds a git grep-based guard to detect lowercase metpo: CURIE prefixes in tracked .ttl/.rq/.sparql/.md.
sparql/README.md	Updates documentation examples to reference METPO: instead of metpo:.
sparql/query_metpo_entities.sparql	Renames the prefix declaration to PREFIX METPO:.
sparql/chem_interaction_props.rq	Updates the query header comment to reference METPO:.
sparql/bacdive_oxygen_phenotype_mappings.rq	Changes the display CURIE generation to emit METPO: instead of metpo:.
docs/src/sparql/definition_sources.sparql	Renames the prefix declaration to PREFIX METPO:.
docs/presentations/icbo_2025/icbo_metpo_slides.md	Updates slide examples to use METPO:.
docs/presentations/icbo_2025/figures/metpo_viz/key_properties.ttl	Updates visualization Turtle to use METPO: throughout.
docs/presentations/icbo_2025/figures/metpo_viz/current_metpo_structure.ttl	Updates Turtle snippet to use METPO: throughout.
docs/n4l/graphdb_workflow/sparql/metpo_classes_temperature_limits.rq	Updates archived workflow query to use METPO: in prefix and term references.
.github/workflows/curie-prefix-case.yml	Adds CI workflow to run the guard script on pushes/PRs to main.

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