Function parse_codex_jsonl 

pub fn parse_codex_jsonl(stdout: &str) -> Result<CodexResult, AppError>

Parses JSONL output from codex exec --json.

Event format (DOTS notation):

• thread.started — session init
• turn.started — model turn begins
• item.completed — message or tool call; last agent_message wins
• turn.completed — includes usage stats
• turn.failed — error with optional rate-limit indicator
• error — schema or validation error

G32 (v1.0.69): this function is the single source of truth for JSONL parsing. Both enrich and ingest --mode codex consume it.