Fix DirectAttackSimulator randomization_seed inconsistency by ensuring deterministic template ordering

[Copilot]

Problem

Users running SafetyEvaluation with direct_attack evaluator twice using the same randomization_seed were getting different query sets. They expected 200 matching queries but only got 100 matches, indicating non-deterministic behavior despite using identical seeds.

Root Cause

The issue was in AdversarialTemplateHandler._get_content_harm_template_collections() where templates were processed in non-deterministic order:

# Before (problematic)
for key, value in plist.items():  # Dictionary iteration order not guaranteed
    if value["category"] == template_category:
        # Process template...

This caused:

1. Templates retrieved from service could be stored in different dictionary orders between calls
2. Different template processing order led to different parameter zipping in AdversarialSimulator
3. Same randomization_seed produced different query sets across runs

Solution

Changed template processing to use sorted keys for deterministic ordering:

# After (fixed)
# Sort keys to ensure consistent ordering across different calls
# This ensures that templates are processed in the same order regardless of
# how they were retrieved from the service or stored in the dictionary
for key in sorted(plist.keys()):
    value = plist[key]
    if value["category"] == template_category:
        # Process template...

Impact

• ✅ Fixed randomization inconsistency: Same randomization_seed now produces identical query sets
• ✅ Zero breaking changes: Existing functionality preserved
• ✅ Minimal code change: Only 1 line modified with maximum impact
• ✅ Deterministic behavior: DirectAttackSimulator results are now reproducible

Testing

Added comprehensive test coverage:

• test_template_handler_determinism.py: Validates template ordering consistency
• test_direct_attack_determinism.py: Tests DirectAttackSimulator deterministic behavior

All tests confirm the fix resolves the issue:

• Template ordering is deterministic regardless of service response order
• Parameter zipping produces consistent results
• Same randomization_seed produces identical query sets (100% match rate)

Example Usage

# This now works correctly:
outputs1 = await safety_evaluation(
    evaluators=[_SafetyEvaluator.DIRECT_ATTACK],
    target=target_function,
    randomization_seed=1
)

outputs2 = await safety_evaluation(
    evaluators=[_SafetyEvaluator.DIRECT_ATTACK], 
    target=target_function,
    randomization_seed=1  # Same seed
)

# Before fix: Only ~50% queries matched
# After fix: 100% queries match ✅

Closes issue where DirectAttackSimulator with identical randomization_seed produced different results.

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