Gate Azure integration tests on explicit deploy context

[johnstel]

Problem statement

azure_infrastructure_test.py fails with subscription_id must not be None when Azure context is missing. This makes validation non-reproducible and blocks reliable go/no-go for demos.

Priority

P0 — blocks integration validation for demo readiness.

Acceptance criteria

• Tests fail fast with clear messaging when required Azure env/auth is missing, or cleanly skip where appropriate.
• Required env vars are centrally validated before integration test execution.
• Documented command path for running integration tests in demo tenant context.
• Baseline validation command set is reproducible on a clean environment.

Checklist

• Add explicit preflight for AZURE_SUBSCRIPTION_ID and auth context.
• Refactor tests to avoid import-time hard failure on missing env.
• Update validation docs with required setup and expected outcomes.
• Re-run full validation suite in demo context.

[github-actions]

📋 Assigned to Wash (Validation Engineer)

Issue: #4 — Gate Azure integration tests on explicit deploy context

Wash will pick this up in the next Copilot session.

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Wash, work on issue #4

[johnstel]

@copilot please start on this issue and open a draft PR when ready.