[yaoharry]

Summary

A truncated or malformed HTTP response can raise http.client.HTTPException outside urllib's usual network exceptions, aborting gateway setup instead of returning a failure reason. Handle these failures in the shared HTTP helpers: GET callers use their existing bounded retry policy, and writes return a failure without replaying the request.

Test plan

• All eight new regression cases failed on the original code. The complete tests/test_databricks.py suite now passes: 423 tests.
• Covers truncated bodies, malformed status lines, zero and exhausted retry budgets, successful recovery using only the complete response, and single-attempt POST/PATCH/DELETE failures.
• Repository-wide Ruff lint, format checks, and ty check src/ pass.
• Transport faults are injected at the HTTP boundary; no live gateway recovery is claimed.