fix: add 429 retry with exponential backoff and increase rate limit delay

- Retry up to 5 times on HTTP 429 with 2s/4s/8s/16s backoff
- Move inter-request delay before each request (was after)
- Increase base delay from 1s to 2s between requests
- Fix: only sleep after first request (skip delay on first call)

0 files changed, 0 insertions, 0 deletions