Update cheatsheets

tldr/codex

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# codex
+
+> Natural language code assistant for the terminal, powered by OpenAI.
+> Reads and edits files in your current directory to fulfill requests.
+> More information: <https://github.com/openai/codex>.
+
+- Start an interactive Codex session in the current directory:
+
+`codex`
+
+- Run a single Codex command using a prompt:
+
+`codex "{{your prompt}}"`
+
+- Run a prompt with automatic approval of all file edits and commands:
+
+`codex {{[-a|--approval-mode]}} full-auto "{{your prompt}}"`
+
+- Use a specific provider and model:
+
+`codex --provider {{provider_name}} {{[-m|--model]}} {{model_name}} "{{your prompt}}"`
+
+- Load the entire repository as context (experimental):
+
+`codex --full-context "{{your prompt}}"`
+
+- Show the resource usage for the current session (run this command inside a session):
+
+`/cost`
+
+- Display help:
+
+`codex --help`