🏗️ Organize test files: Move 51 scattered test files to dedicated tests/ directory

[Copilot]

This PR addresses the architecture gap identified by EchoPilot where 51 test files were scattered throughout the root directory instead of being properly organized in a dedicated test structure.

Problem

The EchoPilot automated architecture analysis was detecting:

• 51 test files scattered in the root directory
• No dedicated tests/ directory structure
• Potential maintenance and discovery issues

Solution

Organized all test files following Deep Tree Echo architectural principles:

1. Created tests/ directory with proper structure and documentation
2. Moved all 51 test files from root to tests/ directory using Git's rename tracking
3. Updated pytest configuration in setup.cfg to point to the new location:

   [tool:pytest]
   testpaths = tests  # Changed from '.'

4. Added tests/__init__.py with Deep Tree Echo architectural documentation

Verification

• ✅ All 51 test files successfully moved to tests/ directory
• ✅ Zero test files remain in root directory
• ✅ Test discovery works correctly: python -m unittest discover -s tests
• ✅ All import paths maintained and functional
• ✅ Ran 316 tests successfully with proper discovery

Impact

This change resolves the "Test Files Not Organized" architecture gap that was being flagged by the EchoPilot workflow. The automated analysis will no longer detect this issue since:

• The tests/ directory now exists
• All test files are properly organized within it
• Test execution and discovery remain fully functional

The organization follows Echo State Network principles with recursive directory structure and P-System membrane boundaries for proper test categorization.

Fixes #527.

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