Wires the agent/account_usage module from the preceding commit into
/usage so users see provider-side quota/credit info alongside the
existing session token report.
CLI:
- `_show_usage` appends account lines under the token table. Fetch
runs in a 1-worker ThreadPoolExecutor with a 10s timeout so a slow
provider API can never hang the prompt.
Gateway:
- `_handle_usage_command` resolves provider from the live agent when
available, else from the persisted billing_provider/billing_base_url
on the SessionDB row, so /usage still returns account info between
turns when no agent is resident. Fetch runs via asyncio.to_thread.
- Account section is appended to all three return branches: running
agent, no-agent-with-history, and the new no-agent-no-history path
(falls back to account-only output instead of "no data").
Tests:
- 2 new tests in tests/gateway/test_usage_command.py cover the live-
agent account section and the persisted-billing fallback path.
Salvaged from PR #2486 by @kshitijk4poor. The original branch had
drifted ~2615 commits behind main and rewrote _show_usage wholesale,
which would have dropped the rate-limit and cached-agent blocks added
in PRs #6541 and #7038. This commit re-adds only the new behavior on
top of current main.
bcc5d7b67d