Update SECURITY.md with usage warnings

[dwaltersbal-mlg]

Added warning about the use of sensitive information and copyright infringement.

[sentry]

Bug: The PGP key has been removed from SECURITY.md and the file's Markdown is corrupted, breaking the secure reporting process and document rendering.
_{Severity: HIGH}

Suggested Fix

Restore the original PGP key block to the SECURITY.md file. Ensure the PGP key fingerprint 'E406 C27A E971 6515 A1B1 ED86 641D 2F6C 230D BE3B' is present and correctly formatted within a valid Markdown code block.

Prompt for AI Agent

Review the code at the location below. A potential bug has been identified by an AI
agent. Verify if this is a real issue. If it is, propose a fix; if not, explain why it's
not valid.

Location: SECURITY.md#L19-L24

Potential issue: The legitimate PGP key fingerprint has been deleted from the
`SECURITY.md` file and replaced with fabricated text. This change prevents users who
need to report a vulnerability from finding the necessary PGP key, breaking the
documented secure reporting workflow. Additionally, the injected text ` ```
WARNING!!!!!...` merges the opening triple-backtick fence with text on the same line and
removes the closing fence, which violates Markdown syntax and will corrupt the rendering
of the document.

_{Did we get this right? 👍 / 👎 to inform future reviews.}

[dwaltersbal-mlg]

WARNING. THIS IS PRIVATE FEDERAL PROPERTY, NOT FOR PERSONAL OR PUBLIC USE . THIS IS COPYRIGHT INFRINGEMENT , FEDERAL IDENTITY THEFT, FRAUD ECT.. ALL CONNECTIONS FACE POSSIBLE CHARGES AND FINES ..