fix: sdk-5295 preserve request options and api results - #122

What changed

• return underlying client results from module-level API calls
• pass configured proxy and timeout options to requests.Session.post
• use time.monotonic() and remove the external monotonic dependency
• add focused regression tests

Why

The module proxy discarded client return values. The request layer built proxy and timeout kwargs but did not pass them to the session.

Validation

• 7 focused consumer timing and batching tests passed
• 2 new return-value and request-option tests passed
• git diff --check passed
• the full suite requires data-plane environment credentials and was not used as the local gate

References

• SDK-5295
• audit and merge plan