Proposal: add an enterprise deployment readiness checklist to docs

[kmishra1204]

Proposal\nAdd a concise enterprise deployment readiness checklist in docs for teams moving from experiments to production pilots.\n\n### Candidate checklist sections\n- identity/secrets boundaries\n- sandbox and tool-execution controls\n- observability and tracing defaults\n- rollback and incident response basics\n\n## Why this helps\nAutoGen adoption is expanding in enterprise environments. A practical readiness checklist can improve implementation quality and reduce avoidable production risks.\n\nHappy to help with a docs PR if this aligns with maintainers' direction.

[kmishra1204]

Opened a docs PR for this proposal: https://github.com/microsoft/autogen/pull/7853\n\nIt adds contributor guidance for enterprise deployment readiness documentation (security boundaries, observability, rollback).