defect: binary executables and unreferenced files polluting repository

[krystophny]

Found during PLAY workflow audit - dead code cleanup needed:

Binary Executables (should be removed)

• bar_chart_demo_temp - ELF 64-bit executable, 747KB
• fortplot_bridge - executable file
• terminal - PNG image file (should be in .gitignore)
• test.unsupported - PNG image file, 352KB

Impact

• Repository pollution with binary files
• Increased clone size and CI overhead
• Violation of source code repository principles
• Files listed in .gitignore but still present

Root Cause

Binary files were committed instead of being properly excluded by .gitignore

Solution

1. Remove binary executables from repository
2. Add to .gitignore if needed
3. Clean up build artifacts
4. Verify .gitignore effectiveness

[krystophny]

Consolidated into PRODUCT BACKLOG meta-issue #703 - Repository cleanup theme