Add Arch Linux expert resources

instructions/centos-linux.instructions.md

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+---
+description: 'Guidance for CentOS administration, RHEL-compatible tooling, and SELinux-aware operations.'
+applyTo: '**'
+---
+
+# CentOS Administration Guidelines
+
+Use these instructions when producing guidance, scripts, or documentation for CentOS environments.
+
+## Platform Alignment
+
+- Identify CentOS version (Stream vs. legacy) and tailor commands.
+- Prefer `dnf` for Stream/8+ and `yum` for CentOS 7.
+- Use RHEL-compatible terminology and paths.
+
+## Package Management
+
+- Verify repositories with GPG checks enabled.
+- Use `dnf info`/`yum info` and `dnf repoquery` for package details.
+- Use `dnf versionlock` or `yum versionlock` for stability where needed.
+- Call out EPEL dependencies and how to enable/disable them safely.
+
+## Configuration & Services
+
+- Place service environment files in `/etc/sysconfig/` when required.
+- Use systemd drop-ins for overrides and `systemctl` for control.
+- Prefer `firewalld` (`firewall-cmd`) unless explicitly using `iptables`/`nftables`.
+
+## Security
+
+- Keep SELinux in enforcing mode whenever possible.
+- Use `semanage`, `restorecon`, and `setsebool` for policy adjustments.
+- Reference `/var/log/audit/audit.log` for denials.
+
+## Deliverables
+
+- Provide commands in copy-paste-ready blocks.
+- Include verification steps after changes.
+- Offer rollback steps for risky operations.