Deployment validation matrix + smoke test contract

[mikemcdougall]

Summary

Define the deployment validation matrix (AOT/JIT x runtime) and a shared smoke test contract.

Tasks

• Define matrix (AOT + JIT x Lambda x ECS x Functions x Container Apps x Helm).
• Specify required env vars and health endpoints for smoke tests.
• Create a minimal smoke test script/contract.
• Run smoke tests in real AWS and Azure accounts for at least one AOT and one JIT deployment.

Acceptance Criteria

• Matrix documented with expected pass/fail states.
• Smoke test contract exists and is referenced by templates.

Notes

Follow-up from epic #278 MVP rescope.