Improve readiness: security, DR, observability, docs#2

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samuelbailey123 wants to merge 3 commits into

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feat/readiness-improvements

Commits on Mar 11, 2026

Add non-root user, health check, and workspace to Dockerfile
samuelbailey123
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Expand README with security, DR, observability, and scalability docs
samuelbailey123
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Add shellcheck linting and PR-level test job to CI workflow
samuelbailey123
committed