[Blueprints] Execute every v2 schema variant in CI

[adamziel]

What it does

This PR adds CI tests to:

• Use every kind of Blueprint v2 field and nested variant at least once.
• Validate it.
• Compile it.
• Boot a clean WordPress.
• Actually run it.
• Fail if anything breaks or becomes unsupported.

Other changes

Breaking schema change: font declarations now accept FileDataReference, not directories or Git paths. The runner requires a file there, so the schema now rejects inputs it cannot execute.

Testing instructions

CI :)

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

Adds a schema-driven conformance suite to ensure every reachable Blueprint v2 schema variant validates and compiles, and tightens the font-related schema contract to only allow file references.

Changes:

• Added an occurrence-sensitive schema conformance test that walks the published v2 schema and asserts fixture coverage + successful compilation.
• Added dense fixtures intended to cover every reachable schema branch/variant.
• Tightened the v2 schema/validator so fonts and fontFace.src require FileDataReference (rejecting directory/git sources during validation).

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
packages/playground/blueprints/src/tests/v2/schema-conformance.spec.ts	New schema-walking conformance suite + compilation assertions.
packages/playground/blueprints/src/tests/v2/schema-conformance-fixtures.ts	New dense fixture set designed to cover all reachable schema variants.
packages/playground/blueprints/src/lib/v2/wep-1-blueprint-v2-schema/appendix-A-blueprint-v2-schema.ts	Tightens TypeScript schema types for fonts and fontFace.src to FileDataReference.
packages/playground/blueprints/public/blueprint-v2-schema-validator.js	Updates generated validator for FileDataReference changes.
packages/playground/blueprints/public/blueprint-schema.json	Updates published JSON schema for FileDataReference changes + regenerated aliases.

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