Note

Strengthens error propagation so provider error details surface to clients.

• Enhances convert_stream_error to include response body (when available) and request_id in messages; attaches raw_response to FatalStreamError
• Improves inject_extra_request_data_and_send_eventsource_with_headers to read response bodies for InvalidStatusCode/InvalidContentType and return detailed FatalStreamError with raw_response
• Adds e2e tests (tests/e2e/providers/errors.rs) verifying provider error messages propagate through HTTP and embedded gateways for both streaming and non-streaming (e.g., Anthropic "budget_tokens")

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