shiavm006 opened a new pull request, #598:
URL: https://github.com/apache/mahout/pull/598
## Problem
Users could call gate operations before initializing a circuit, causing
cryptic `AttributeError: 'NoneType'` crashes deep in backend code.
Example:
```python
qumat = QuMat(config)
qumat.apply_hadamard_gate(0) # Crash!
# AttributeError: 'NoneType' object has no attribute 'h'
```
## Solution
- Added `_ensure_circuit_initialized()` helper method
- Validates circuit exists before all gate operations (18 methods covered)
- Raises clear `RuntimeError` with actionable message:
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