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Add automatic retry logic to doRequest for HTTP 429 responses. Uses Retry-After header when present, otherwise exponential backoff (1s, 2s, 4s). Respects context cancellation during waits. Defaults to 3 max retries with 1s base delay. Includes 7 new tests covering retry success, exhaustion, Retry-After header, context cancellation, non-429 errors, and backoff calculation. Closes leeworks-agents/gitea-mobile#132 Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>