Agent jobs (spawn_agents_on_csv) + progress UI

[daveaitel-openai]

Summary

• Add agent job support: spawn a batch of sub-agents from CSV, auto-run, auto-export, and store results in SQLite.
• Simplify workflow: remove run/resume/get-status/export tools; spawn is deterministic and completes in one call.
• Improve exec UX: stable, single-line progress bar with ETA; suppress sub-agent chatter in exec.

Why

Enables map-reduce style workflows over arbitrarily large repos using the existing Codex orchestrator. This addresses review feedback about overly complex job controls and non-deterministic monitoring.

Demo (progress bar)

./codex-rs/target/debug/codex exec \
  --enable collab \
  --enable sqlite \
  --full-auto \
  --progress-cursor \
  -c agents.max_threads=16 \
  -C /Users/daveaitel/code/codex \
  - <<'PROMPT'
Create /tmp/agent_job_progress_demo.csv with columns: path,area and 30 rows:
path = item-01..item-30, area = test.

Then call spawn_agents_on_csv with:
- csv_path: /tmp/agent_job_progress_demo.csv
- instruction: "Run `python - <<'PY'` to sleep a random 0.3–1.2s, then output JSON with keys: path, score (int). Set score = 1."
- output_csv_path: /tmp/agent_job_progress_demo_out.csv
PROMPT

Review feedback addressed

• Auto-start jobs on spawn; removed run/resume/status/export tools.
• Auto-export on success.
• More descriptive tool spec + clearer prompts.
• Avoid deadlocks on spawn failure; pending/running handled safely.
• Progress bar no longer scrolls; stable single-line redraw.

Tests

• cd codex-rs && cargo test -p codex-exec
• cd codex-rs && cargo build -p codex-cli

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