Module codex 

Parse Codex (OpenAI) transcript .jsonl files into Events. Pure parser — no notify dependency, no IO beyond file reads.

Functions

parse_codex_line

Parse one .jsonl line. Returns Some(Event) for action-bearing lines. Extracts usage.prompt_tokens / usage.completion_tokens when present.

scan_codex_session_dir

Walk all .jsonl files under dir; return inferred SessionRecord + events. Agent = “codex”. Session id = dir name.