Issue templates are Forms YAML with a .md extension, so they render as blank issues

[felladrin]

Source: https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/about-issue-and-pull-request-templates

Problem: .github/ISSUE_TEMPLATE/bug_report.md, feature_request.md, and security_vulnerability.md use GitHub Issue Forms syntax (description:, body:, type: textarea, dropdowns) but carry a .md extension. GitHub only interprets Forms in .yml/.yaml; as .md the carefully designed fields never render and reporters get an essentially empty issue body. There's also no config.yml.

Fix: Rename all three to .yml; verify each renders as a form. Add .github/ISSUE_TEMPLATE/config.yml with contact_links (Discussions, private security reporting, live demo).

Files: .github/ISSUE_TEMPLATE/*