docs: add SECURITY.md and LICENSE

[andhijeannot]

Adds missing files required before going public:

• SECURITY.md — responsible disclosure policy with GitHub Security Advisories link
• LICENSE — already included in the squashed initial commit

Also: Dependabot security updates enabled via repo settings.

[Copilot]

Pull request overview

Adds repository meta-documentation needed for public release readiness by introducing a security disclosure policy and ensuring a license file is present.

Changes:

• Add SECURITY.md with supported versions policy and private vulnerability reporting via GitHub Security Advisories.
• Add LICENSE (MIT) file.

Reviewed changes

Copilot reviewed 1 out of 1 changed files in this pull request and generated no comments.

File	Description
SECURITY.md	Documents vulnerability reporting process, support policy, and security scope areas.
LICENSE	Provides the project’s MIT licensing terms for public distribution.

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