feat(cli): show account quota in status bar (codex provider)

[sawx0002-COLN]

What does this PR do?

Adds a compact quota X% label to the CLI status bar for the openai-codex provider, so users running on a metered ChatGPT account can see their remaining quota without leaving the agent.

The label is refreshed asynchronously on a 60s TTL via a background thread, so the hot render path never blocks on the provider API. A new helper render_account_usage_compact in agent/account_usage.py picks the session/primary window and emits the terse quota X% label.

Related Issue

N/A — small UX-only addition.

Type of Change

• ✨ New feature (non-breaking change that adds functionality)

Changes Made

• agent/account_usage.py (+23) — new render_account_usage_compact helper that selects the session/primary quota window and formats it as a compact label
• cli.py (+67) — status-bar wiring for the new label, with a 60s TTL background refresher so render isn't blocked on the provider API
• tests/cli/test_cli_status_bar.py (+20) — new test cases covering the codex quota label rendering and narrow-terminal collapse behavior
• tests/test_account_usage.py (+15) — unit tests for the compact renderer's session/primary window preference

No changes to existing behavior for non-codex providers; the label only appears when openai-codex is the active provider and a quota window is available.

How to Test

1. Configure a Hermes session with the openai-codex provider authenticated against a ChatGPT account that has a quota window.
2. Launch the CLI: hermes.
3. The status bar should display a quota X% segment alongside the other status fragments. On narrow terminals it should collapse cleanly.
4. Targeted test run:

   pytest tests/cli/test_cli_status_bar.py tests/test_account_usage.py -q
   

Checklist

Code

• I've read the Contributing Guide
• My commit messages follow Conventional Commits
• I searched for existing PRs to make sure this isn't a duplicate
• My PR contains only changes related to this feature (no unrelated commits)
• I've run the relevant tests and they pass (33/33 on the two test files; 73/73 on tests/tools/test_checkpoint_manager.py for sanity)
• I've added tests for my changes
• I've tested on my platform: Linux 6.17 (Ubuntu-flavored)

Documentation & Housekeeping

• No documentation changes needed — internal status-bar UX, no new config keys or CLI surface
• No cli-config.yaml.example changes — no config keys added
• No architecture/workflow changes
• Cross-platform: status-bar rendering goes through existing prompt-toolkit width fragments, no platform-specific paths
• No tool description/schema changes

Screenshots / Logs

Status-bar renders inline like the existing fragments — ... | quota 73% | .... Refresh is silent in the background.

[alt-glitch]

Duplicate of #19063 which implements the same Codex quota indicator in the CLI status bar. See also #16644 (closed TUI version) and #17654 (configurable status bar fields).