chore(cleanup): cleanup-defensive — drop no-op except in HTTP retry loop

Removed the trailing `except Exception: raise` after the
RETRYABLE_EXCEPTIONS handler in HttpClient.get's retry loop. Without
the catch, non-retryable exceptions propagate identically (Python's
default behavior). Retry semantics unchanged.

Verify: 227/227 tests pass, mypy 36 baseline unchanged, ruff clean.

Co-Authored-By: Claude Opus 4.7 (1M context) <[email protected]>

Author: clarityzach

src/docpull/http/client.py

@@ -439,10 +439,6 @@ async def get(
                     logger.error(f"HTTP fetch error for {url} after {self._max_retries + 1} attempts: {e}")
                     raise
 
-            except Exception:
-                # Non-retryable error - re-raise immediately
-                raise
-
         # Should not reach here, but just in case
         if last_error:
             raise last_error