Summary

Introduces a resilient API layer between BridgeWise and all external upstream APIs, addressing rate limit failures surfaced during real-time quote refresh

Changes

• rateLimitedApi.js — core client with token bucket, request queue, circuit breaker, and retry logic
• Domain helpers as drop-in replacements for existing fetch calls
• rateLimitedApi.test.js — full unit test coverage

Behaviour

• Requests exceeding rateLimitPerSecond are delayed, not dropped
• 429/5xx trigger retries with exponential backoff + jitter; Retry-After header is respected
• Circuit opens after 5 failures, blocking requests until recovery timeout elapses
• Non-retryable errors (4xx) surface immediately — no wasted retries

Testing

npx vitest rateLimitedApi.test.js

Closes #64