Add Development Workflow

Development-Workflow.md

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+# Development Workflow
+
+This page documents how to safely develop and maintain Athenix.
+
+## Required Checks
+
+Before committing:
+
+```bash
+nix fmt
+nix flake check
+```
+
+## Testing Hosts
+
+```bash
+nix build .#nixosConfigurations.nix-laptop1.config.system.build.toplevel
+```
+
+## CI
+
+Gitea Actions automatically validates:
+- Flake evaluation
+- Formatting
+- Key system builds
+- Installer and container artifacts
+
+## Rollbacks
+
+If a system breaks:
+
+```bash
+sudo nixos-rebuild switch --rollback
+```