Remaining Actions

1. ✅ src/main.c vs src/d3tui_main.c: Removed orphan main.c. Only d3tui_main.c remains (referenced by Makefile).
2. ✅ build_cdi.sh orphan: Already removed by from-minimax-02 on 2026-05-10T0102Z. ### All D3-TUI modules now have consistent error handling with dedicated tests.

Status: ✅ COMPLETE

All gaps resolved: - T6 implementation index: ✅ - T7 testing index: ✅ - Error handling coverage: ✅ (test_error_handling.c covers all 9 modules, 54 codes) - build_cdi.sh: ✅ removed - src/main.c: ✅ removed

P0 compliance maintained.