feat(usage): unified usage tracking with auth refresh (#9281)

[CasualDeveloper]

Summary

Add /usage as the single source of truth for provider usage data (Codex, Copilot, Claude) with TUI integration and automatic token refresh. Users can now view rate limits via /usage command or sidebar panel, with provider-specific auth flows handling token expiry transparently.

Closes #9281, closes #728
Supersedes #6905, #7837
Alternate implementation to #9301

Changes

Core

• New packages/opencode/src/usage/index.ts (~850 lines): usage fetchers for Codex (/backend-api/wham/usage), Copilot (/copilot_internal/user), Claude (/api/oauth/usage) with schema validation and caching
• New packages/opencode/src/server/usage.ts: GET /usage endpoint with ?provider= filter and ?refresh= option
• Claude token auto-refresh on 401 via console.anthropic.com/v1/oauth/token
• usage.updated bus event for sidebar sync

Auth

• packages/opencode/src/cli/cmd/auth.ts: second device-flow prompt during Copilot login using VS Code client ID (Iv1.b507a08c87ecfe98) to capture usage token for copilot_internal/user
• packages/opencode/src/auth/index.ts: optional usage field in OAuth schema
• packages/opencode/src/plugin/copilot.ts: attempt service token exchange via copilot_internal/v2/token; fallback to device token
• packages/opencode/src/provider/auth.ts: persist usage token

TUI

• New dialog-usage.tsx: renders usage windows with progress bars, reset times, credits/quota
• prompt/index.tsx: /usage command with --current, --all flags; always fetches fresh data
• sidebar.tsx: collapsible Usage panel; refreshes on usage.updated events and assistant turn completion
• packages/opencode/src/config/config.ts: tui.show_usage_provider_scope setting ("current" | "all")

SDK/OpenAPI

• Regenerated packages/sdk/openapi.json and packages/sdk/js/src/v2/gen/types.gen.ts

Tests

• New packages/opencode/test/server/usage.test.ts: mock auth scenarios, provider filtering, error handling

AI Assistance

• Tools: OpenCode + openai/gpt-5.2-codex
• Testing: Tested on test build (bun turbo typecheck && bun run --cwd packages/opencode test test/server/usage.test.ts && bun run --cwd packages/opencode build)
• Review: Human operator personally guided and reviewed changes

Notes

• Baseline test failures (snapshot/skill tests) are unrelated
• Full bun turbo test not run this session
• E2E tests for device-flow not added (manual verification)
• Follow-up: docs for tui.show_usage_provider_scope config

[github-actions]

The following comment was made by an LLM, it may be inaccurate:

Potential Duplicates Found:

1. PR #9301: feat(tui): add /usage command and sidebar usage section

• feat(tui): add /usage command and sidebar usage section #9301
• Why related: This PR directly addresses the same /usage command and sidebar usage panel features. The current PR (9545) explicitly mentions it as an "Alternate implementation to feat(tui): add /usage command and sidebar usage section #9301", indicating significant overlap in functionality.

2. PR #6905: feat: display Anthropic and OpenAI OAuth usage in status dialog and sidebar

• feat: display Anthropic and OpenAI OAuth usage in status dialog and sidebar #6905
• Why related: Similar goal of displaying provider usage data in the sidebar and dialog. The current PR supersedes this one (as noted in the description).

3. PR #9069: feat: Multi-Account OAuth Rotation with Settings UI and CLI Enhancements

• feat: Multi-Account OAuth Rotation with Settings UI and CLI Enhancements #9069
• Why related: Related to auth token management and OAuth handling, which overlaps with the token refresh and auth flow changes in the current PR.