fix: resolve YAML indentation issues in Python debugging script

YAML INDENTATION FIX: Use single-line Python commands to avoid indentation

Issue:
- IndentationError persists due to YAML multi-line string handling
- Multi-line Python strings in YAML cause indentation conflicts
- Workflow still failing with syntax errors

Solution:
- Use single-line Python commands with exec()
- Escape newlines with \n in exec() strings
- Separate commands for each import test
- Avoid YAML multi-line string indentation issues

Changes:
- Single-line venv/bin/python -c commands
- exec() with escaped newlines for try/except blocks
- Separate commands for src and aitbc imports
- Maintains debugging functionality without YAML conflicts

Expected results:
- No more IndentationError
- Import debugging should work
- Workflow should continue to pytest execution
- Clear feedback on import success/failure

This should finally resolve the YAML/Python indentation conflict
and allow the workflow to proceed to actual test execution.

.gitea/workflows/python-tests.yml

@@ -128,24 +128,8 @@ jobs:
             
             # Test specific imports that are failing
             echo "Testing problematic imports..."
-            venv/bin/python -c "
-import sys
-print('Testing src import...')
-sys.path.insert(0, '/opt/gitea-runner/workspace/repo/apps/agent-protocols/src')
-try:
-    import message_protocol
-    print('✅ src.message_protocol import successful')
-except Exception as e:
-    print(f'❌ src import failed: {e}')
-
-print('Testing aitbc import...')
-sys.path.insert(0, '/opt/gitea-runner/workspace/repo/apps/blockchain-node/src')
-try:
-    import aitbc_chain
-    print('✅ aitbc_chain import successful')
-except Exception as e:
-    print(f'❌ aitbc import failed: {e}')
-"
+            venv/bin/python -c "import sys; print('Testing src import...'); sys.path.insert(0, '/opt/gitea-runner/workspace/repo/apps/agent-protocols/src'); exec('try:\n    import message_protocol\n    print(\"✅ src.message_protocol import successful\")\nexcept Exception as e:\n    print(f\"❌ src import failed: {e}\n')"
+            venv/bin/python -c "import sys; print('Testing aitbc import...'); sys.path.insert(0, '/opt/gitea-runner/workspace/repo/apps/blockchain-node/src'); exec('try:\n    import aitbc_chain\n    print(\"✅ aitbc_chain import successful\")\nexcept Exception as e:\n    print(f\"❌ aitbc import failed: {e}\n')"
             
             echo "=== RUNNING PYTHON TESTS ==="
             echo "Attempting to run tests with comprehensive error handling..."