fix: use scoped package name for spectral npx invocation

[slusset]

Summary

• npx spectral lint in the idd-check action resolves to the wrong npm package (spectral@0.0.0) instead of @stoplight/spectral-cli, causing OpenAPI linting to fail for downstream consumers
• Changed to npx @stoplight/spectral-cli lint which correctly resolves the scoped package already installed on the preceding line

Test plan

• Consumer repo running idd-check action no longer gets sh: 1: spectral: not found
• OpenAPI linting step runs successfully when .spectral.yaml and api.yaml are present

🤖 Generated with Claude Code

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[github-actions]

IDD Compliance Review

Check	Status	Errors	Warnings
Traceability	✅	0	0
Front-Matter	✅	0	0
Capability Scope	✅	0	0
Fixtures	✅	0	0
Models	✅	0	3
Journey Maps	✅	0	0
OpenAPI Lint	✅	0	—
Gherkin Lint	✅	0	—

✅ Traceability

Info

• Found 1 persona file(s)
• Checked 1 journey file(s)
• Checked 2 story file(s)
• Checked 1 feature file(s)
• Checked 2 API operation(s) across 1 contract file(s)
• Checked 1 fixture file(s)
• Checked 1 journey map(s)
• Checked 1 model file(s)

✅ Front-Matter

Info

• Checked 9 spec file(s): 9 passed, 0 with issues

✅ Capability Scope

Info

• Found 1 capability file(s): trade-show-signup
• Scope coverage: 5/5 files covered

✅ Fixtures

Info

• specs/fixtures/mobile-signup.fixture.yaml: valid
• Validated 1 fixture file(s)

✅ Models

Warnings

• specs/models/account.model.yaml: Entity should have a description
• specs/models/account.model.yaml: Entity should define identity field
• specs/models/account.model.yaml: Rule "account-activates-on-signup" should have a description

Info

• Validated 1 model file(s)

✅ Journey Maps

Info

• specs/journey-maps/trade-show-signup.journey-map.yaml: valid
• Validated 1 journey map file(s)

✅ OpenAPI Lint

No results with a severity of 'error' found!

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Total: 0 error(s), 3 warning(s)

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