Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md

[Copilot]

Copies community health files from carlos-emr/carlos to the organization-level .github repository, making them apply as defaults across all repos in the organization.

Files added

• CODE_OF_CONDUCT.md — Contributor Covenant 2.1 with healthcare-specific PHI handling expectations
• CONTRIBUTING.md — Development setup, DCO requirements, branch strategy, code standards
• SECURITY.md — Vulnerability reporting via GitHub Security Advisories, scope, safe harbor

Original prompt

Also in the .github root, bring in from carlos-emr/carlos the - CODE_OF_CONDUCT.md

• CONTRIBUTING.md
• SECURITY.md

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