[codex] Add funding and security templates

[justAbdulaziz10]

Summary

• Add GitHub funding metadata with Mara sponsor links
• Ensure SECURITY.md uses security@iammara.com
• Add complete issue templates and fallback issue template where needed

Validation

• Parsed FUNDING.yml and issue template YAML locally
• git diff --check

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[chatgpt-codex-connector]

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[chatgpt-codex-connector]

Correct the Open Collective slug in funding metadata

The new open_collective value (mara-or-mra) is inconsistent with the repository/org naming used elsewhere (mara-org), so this likely points to a non-existent collective page. If the slug is wrong, the GitHub Sponsor button will send users to a dead donation link and silently reduce funding conversions; please verify and use the exact Open Collective handle.

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