Validate SweepData.from_dict() results entries are dicts, raise HWQueueLoaderError

[Copilot]

SweepData.from_dict() iterated over data["results"] assuming all entries were dicts. Non-dict entries (strings, ints, lists, None) caused AttributeError from .get() to escape rather than a meaningful HWQueueLoaderError.

Changes

• hwqueue_loader.py — Replace the list comprehension in SweepData.from_dict() with an explicit loop that validates each entry with isinstance(r, dict), raising HWQueueLoaderError with the entry index and actual type on failure:

# Before — AttributeError escapes for non-dict entries
results = [SingleRunData.from_dict(r) for r in data.get("results", [])]

# After — clear HWQueueLoaderError with index and type
for i, r in enumerate(raw_results):
    if not isinstance(r, dict):
        raise HWQueueLoaderError(
            f"Invalid schema: 'results[{i}]' must be a dict, got {type(r).__name__}"
        )
    results.append(SingleRunData.from_dict(r))

• tests/test_hwqueue_loader.py (new) — 11 tests covering: valid entries, empty/missing results, non-dict entry types (str, int, list, None), correct index in error message, no AttributeError escaping, and integration through HWQueueLoader.load_sweep() / load_auto().

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