## What changed
- Add `thread-credits` and `estimated-thread-cost` items to the configurable
status line and terminal title for Enterprise workspaces.
- Fetch one shared thread usage estimate only when either item is selected,
omit unavailable values, and refresh the display after turns complete.
- Preserve the last nonzero estimate while usage settles, with bounded delayed
refreshes and retries for transient failures.
## Testing
- Add coverage for configuration, rendering, previews, plan availability,
replay handling, retries, and post-turn settlement.
GitOrigin-RevId: dd69ee621c5bca0e5d9edd32b2bba42487eb1500
## What changed
- Extend `account/usage/read` with an optional `threadId` request and a
backward-compatible `threadUsage` response containing estimated credits,
optional USD cost, and model, reasoning, speed, and token breakdowns.
- Fetch thread usage for eligible Business and Enterprise plans when `/status`
is opened, then update the rendered status card asynchronously.
- Preserve terminal scrollback when replacing a visible status-card tail, and
append a refreshed card when the original tail can no longer be updated.
## Testing
- Add app-server coverage for authentication, canonical thread IDs,
unavailable billing routes, and malformed IDs.
- Add TUI coverage for usage formatting, stale responses, retries, history
updates, terminal reflow, and scrollback preservation.
GitOrigin-RevId: 49300914b3fba917c0f08e8595363e04e5ba6d37
Felipe Coury