🔧 Fix code quality issues in test_echo9ml_integration.py

[Copilot]

This PR resolves 6 code quality violations identified by static analysis in the Echo9ml integration test suite.

Issues Fixed

Unused Variables & Imports:

• Removed unused json import that was never referenced
• Removed unused Path import from pathlib that was never used
• Eliminated goals_with_id variable that was assigned but never accessed
• Removed initial_interactions variable in state persistence test
• Cleaned up initial_reasoning variable in learning session test

Protected Member Access:

• Replaced direct call to _sync_personality_traits() with proper public API usage
• Updated trait synchronization test to use enhanced_personality_update() method calls instead of accessing protected members

Implementation Details

The changes maintain full test functionality while improving code quality:

# Before: Direct protected member access
self.enhanced_arch._sync_personality_traits()

# After: Public API usage that triggers the same synchronization
self.enhanced_arch.enhanced_personality_update("creativity", 0.95, {"test": "sync"})
self.enhanced_arch.enhanced_personality_update("analytical", 0.85, {"test": "sync"})

All modifications follow Deep Tree Echo architecture principles with surgical, minimal changes that preserve the existing test behavior and assertions. The test suite continues to validate the integration between Echo9ml persona evolution and the cognitive architecture framework.

Fixes #532.

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