Context

`src/infra/provider-usage.*` (3,204 lines across 15 files) fetches LLM provider quotas from external APIs (Anthropic, Google, OpenAI, Codex, Copilot, MiniMax, Zai). This is consumer dashboard UX — "how much of my API quota have I used?" It doesn't route through RemoteClaw infrastructure. The auth layer reads API keys from profiles and hits provider rate-limit endpoints.

Found during MBP deep dive audit of `src/infra/`.

Scope

Delete provider-usage files (~15 files, 3,204 lines):

• `provider-usage.ts` (barrel)
• `provider-usage.auth.ts` (269 lines)
• `provider-usage.fetch.ts` + all provider-specific fetchers (claude, gemini, copilot, codex, minimax, zai, shared)
• `provider-usage.format.ts`, `provider-usage.load.ts`, `provider-usage.shared.ts`, `provider-usage.types.ts`
• All corresponding test files (~11 files)

Clean up callers:

• `gateway-cli` likely has a `usage-cost` subcommand — remove or stub
• Status commands that display provider usage — remove the section

Acceptance Criteria

• `grep -r "provider-usage" src/` returns nothing
• `gateway usage-cost` command removed or errors cleanly
• Build passes
• Tests pass

Size

~3,204 lines removed.