Codex footer missing model name — only shows dir label

[nathanschram]

Bug

Codex runs show only 🏷 dir: codex-test in the footer, with no model name. By contrast, Claude runs show 🏷 dir: codex-test | opus 4.6 (1M) · plan — the model name and permission mode are visible.

Reproduction

1. Send any prompt to the Codex engine chat
2. Wait for completion
3. Footer shows: 🏷 dir: codex-test
4. Compare with Claude: footer shows 🏷 dir: codex-test | opus 4.6 (1M) · plan

Expected

Footer should show the Codex model name, e.g. 🏷 dir: codex-test | codex-mini-latest

When approval policy or reasoning overrides are active, those are shown (e.g. safe, high appeared correctly in O3 and O5 tests), but the base model name is missing.

Context

• The /export output shows Model: Codex (capitalised, not the actual model ID)
• The model name in the footer comes from StartedEvent.meta — Codex's thread.started event may not populate model info, or the runner may not extract it
• The /config page shows Model: default · codex-mini-latest — so the config knows the default model, but it doesn't appear in run footers
• Override labels (safe, high) DO appear because they come from EngineOverrides, not from the Codex CLI response

Affected files

• src/untether/runners/codex.py — translate() may not be extracting model info from Codex JSONL events into StartedEvent.meta
• src/untether/markdown.py — meta_line() formatting

Version

v0.35.0rc11 — found during Codex integration testing