fix: show account limits in desktop and TUI /usage

[whzy1314]

Summary

• show provider account limits and available rate-limit lines in Desktop and Ink TUI /usage
• resolve provider identity from the live agent or compute-host metadata/profile context, including OpenAI Codex credential-pool fallback
• keep account-usage reads bounded, fail-open, and off the gateway RPC reader
• intercept only bare /usage, preserving /usage reset [--force] and invalid-subcommand handling through the CLI worker
• retain the current Nous balance model and session-token presentation

Verification

• uv run pytest tests/tui_gateway/test_protocol.py -q — 46 passed
• npm --workspace ui-tui run check — 1,530 passed, 1 skipped; typecheck/build/lint passed (one unrelated pre-existing hook warning)
• uv run ruff check tui_gateway/server.py tui_gateway/methods_session.py tests/tui_gateway/test_protocol.py
• uv run python -m py_compile tui_gateway/server.py tui_gateway/methods_session.py
• git diff --check
• live OpenAI Codex credential-pool smoke test confirmed Desktop output contains session usage and account limits

Closes #45713

[teknium1]

Thanks for tracing the split between the live TUI session and the slash-worker agent; current tui_gateway/server.py:6519-6542 confirms that account and rate-limit lines are still absent from the TUI /usage payload.

Problems

• The new unconditional slash.exec /usage branch would consume /usage reset [--force] and arbitrary /usage arguments as plain usage output. Current main explicitly implements reset and unknown-subcommand handling in cli.py:9676-9691, added by 89bd0fba903b after this PR's 426174a64e81 commit.
• session.usage is dispatched inline because it is absent from _LONG_HANDLERS (tui_gateway/server.py:178-232, 1277-1279). The proposed ten-second account-usage wait would therefore block that fast RPC path.

Suggested changes

• Preserve the current /usage reset [--force] and invalid-subcommand contract when routing live-session usage, and cover both through slash.exec.
• Keep provider account retrieval out of the inline session.usage path, or explicitly offload/cache it and test responsiveness.

Automated hermes-sweeper review.

[whzy1314]

Addressed in 8c57b4a33.

• Rebased the PR onto current main.
• Limited the live-session shortcut to bare /usage; /usage reset [--force] and invalid subcommands continue through HermesCLI, preserving the existing reset/error contract.
• Added session.usage to _LONG_HANDLERS, so provider account retrieval is offloaded from the inline RPC path.
• Added regression coverage for reset/invalid-subcommand routing and for session.usage not blocking fast RPC handlers.

Verification:

• scripts/run_tests.sh tests/tui_gateway/test_protocol.py -v --tb=short — 88 passed
• npm --workspace ui-tui run typecheck — passed
• npm --workspace ui-tui run build — passed
• python -m py_compile tui_gateway/server.py — passed

[whzy1314]

Refreshed onto current main in 0e2cada88.

• adapted the implementation to the split methods_session.py / methods_tools.py architecture
• Desktop bare /usage now appends provider account limits and available rate-limit lines
• TUI session.usage returns and renders the same data without regressing the current balance view
• /usage reset [--force] and invalid subcommands continue through the CLI worker
• provider fetches are bounded, fail-open, profile-scoped, and off the RPC reader

Verification: 46 gateway protocol tests passed; the full Ink TUI check passed with 1,530 tests passed and 1 skipped; Ruff, Python compile, and diff checks passed; a live OpenAI Codex credential-pool smoke test confirmed the Desktop output path.

[whzy1314]

Rebased onto current main in e181acc and resolved the tests/tui_gateway/test_protocol.py conflict while preserving the current gateway/TUI contracts.

Verification:

• scripts/run_tests.sh tests/tui_gateway/test_protocol.py -v --tb=short — 48 passed
• npm --workspace ui-tui run check — 1,545 passed, 1 skipped; typecheck passed; lint passed with one pre-existing warning
• Ruff, Python compile, Windows-footgun, and diff checks passed