ci: add OSV-Scanner SCA gate

[zircote]

Wires reusable-sca-osv.yml (pinned at f83ee805) into ci.yml, matching the pattern already used in structured-madr, ontologies, and MIF. This closes the SCA coverage gap identified by the org-wide OSV-Scanner audit: this repository carries a package-lock.json but had no SCA gate.

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[Copilot]

Pull request overview

Adds a supply-chain security (SCA) gate to this repository’s CI by wiring in the org’s centrally-maintained reusable-sca-osv.yml workflow (SHA-pinned), closing the gap where the repo has a package-lock.json but no OSV/dependency-review enforcement.

Changes:

• Add a new sca job to CI that calls the org reusable OSV-Scanner + dependency-review workflow.
• Configure the gate to fail the dependency-review check at high severity and above.
• Grant the called workflow the required permissions (security-events: write, pull-requests: write, etc.) for SARIF upload and PR annotations.

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