add codex config

.codex/config.toml

@@ -0,0 +1,32 @@
+model = "gpt-5.5"
+model_reasoning_effort = "xhigh"
+personality = "pragmatic"
+plan_mode_reasoning_effort = "xhigh"
+
+approval_policy = "on-request"
+sandbox_mode = "workspace-write"
+web_search = "live"
+
+[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 = "uvx"
+args = ["mcp-nixos"]