Add OpenCode project guidance

AGENTS.md

@@ -279,7 +279,7 @@ Este modulo concentra:
   - publica `config.el`, `init.el`, `packages.el`
 - OpenCode:
   - publica `~/.config/opencode/opencode.json`
-  - usa `opencode.json` no root do repo para carregar contexto do projeto
+  - usa `OPENCODE.md` e `opencode.json` no root do repo para carregar contexto do projeto
   - usa `ollama/qwen2.5-coder:7b` como modelo padrao
 - Wofi:
   - publica `config`, `style.css`, `menu`, `menu.css`

OPENCODE.md

@@ -0,0 +1,9 @@
+# OpenCode Project Notes
+
+This repository is the local NixOS and Home Manager configuration for `ltadeu6`.
+
+- Treat the current working tree as the source of truth.
+- Prefer local files and `read`/`glob`/`grep` tools over `webfetch`.
+- Start with `AGENTS.md` for repo rules, then inspect `hosts/Nixos/configuration.nix` and `home/ltadeu6.nix`.
+- Do not ask for a GitHub URL unless the user explicitly asks about a remote repository.
+- This is a local project, not a template.

opencode.json

@@ -2,8 +2,8 @@
   "$schema": "https://opencode.ai/config.json",
   "model": "ollama/qwen2.5-coder:7b",
   "instructions": [
+    "OPENCODE.md",
     "AGENTS.md",
-    "README.md",
     "home/ltadeu6.nix",
     "hosts/Nixos/configuration.nix"
   ]