feat(codex): add codex config.toml

.codex/config.toml

@@ -0,0 +1,34 @@
+model = "gpt-5.4"
+model_reasoning_effort = "xhigh"
+personality = "pragmatic"
+plan_mode_reasoning_effort = "xhigh"
+
+approval_policy = "on-request"
+sandbox_mode = "workspace-write"
+web_search = "live"
+
+notify = [
+  "terminal-notifier",
+  "-title", "Codex CLI",
+  "-message", "Task completed!",
+  "-sound", "default",
+]
+
+[features]
+multi_agent = true
+prevent_idle_sleep = true
+
+[agents]
+max_threads = 6
+max_depth = 1
+
+[tui]
+status_line = ["model-with-reasoning", "context-remaining", "current-dir", "git-branch", "five-hour-limit"]
+
+[sandbox_workspace_write]
+network_access = true
+
+[mcp_servers.mcp-nixos]
+command = "nix"
+args = ["run", "github:utensils/mcp-nixos", "--"]
+