Remove broken generated Ceefax CLI surface

[fredporter]

Summary

• remove four overlapping file-splitter-generated Ceefax CLI modules
• remove the top-level ceefax dispatch entry
• eliminate the command path that imported a nonexistent Ceefax MCP protocol
• retain the underlying Ceefax runtime modules; only the non-importable CLI facade is removed

Verification

• importing the old facade was confirmed to fail with IndentationError before removal
• scoped audit finds no Ceefax CLI or nonexistent protocol references
• full Python matrix: 198 passed, 33 existing skips, 2 existing warnings