docs: add security policy

[0x77dev]

Summary

• add SECURITY.md with the private vulnerability reporting path
• document supported security-report scope and disclosure expectations

Verification

• added-line secret scan: no matches
• nix flake check --no-build -L: passed
• independent peer review: 2 PASS after fixing the pdf-sign --version wording

Full nix flake check -L was attempted but timed out after 600s while cold-building dependencies, before any project failure.

Assisted-by: vasyl

Summary by CodeRabbit

• Documentation
  • Added a security policy with clear instructions for privately reporting vulnerabilities.
  • Included guidance on what details to submit, such as reproduction steps and expected vs. actual behavior.
  • Clarified which releases are covered and how disclosure is coordinated until a fix is available.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI

Review profile: CHILL

Plan: Pro

Run ID: e6380527-fb4a-4a34-8ed0-e425d2223aad

📥 Commits

Reviewing files that changed from the base of the PR and between 70d4bcf and 6914007.

📒 Files selected for processing (1)

• SECURITY.md

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Walkthrough

This change adds a new SECURITY.md file to the repository, documenting the vulnerability reporting process via private GitHub advisories, required reproduction information, supported versions, and disclosure timing coordination.

Changes

Security Policy Documentation

Layer / File(s)	Summary
Add SECURITY.md policy SECURITY.md	New file documenting private vulnerability reporting workflow, required details, supported versions (main and latest release), and disclosure timing.

Estimated code review effort: 1 (Trivial) | ~2 minutes

Poem

A rabbit hops with policy in paw,
Reporting bugs by trusted law,
Private advisories, safe and sound,
Disclosure timed when fixes are found,
Hop hop hooray, security's here! 🐇🔒

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the main change: adding a security policy document.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch vasyl/security-policy-20260703

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