configure opencode agent with project guidelines and safety rules

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Co-Authored-By: opencode <noreply@opencode.ai>

AGENTS.md

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+# AGENTS.md
+
+This file provides guidelines for AI coding agents operating within this repository.
+
+## Build, Lint, and Test Commands
+
+- **Build**: `make build-usb` (Builds the NixOS workshop ISO)
+- **Lint**: No specific linting command found. Follow general code style guidelines.
+- **Test**: No specific testing command found. Use `make status-cloud` for health checks.
+- **Single Test**: No specific command for running a single test.
+
+## Code Style Guidelines
+
+- **Imports**: Organize imports alphabetically. Avoid unused imports.
+- **Formatting**: Adhere to Nixpkgs formatting conventions. Use `nixpkgs-fmt` if available.
+- **Types**: Use Nix's type system rigorously. Define types explicitly where possible.
+- **Naming Conventions**:
+    - Variables and functions: `camelCase` or `snake_case` (be consistent).
+    - Package names: `lowercase-with-hyphens`.
+- **Error Handling**: Handle errors explicitly. Use Nix's error reporting mechanisms.
+- **General**:
+    - Keep code concise and readable.
+    - Prefer declarative over imperative approaches.
+    - Document complex logic.