History of signer_line 1 change

In src/cli/mcp.rs, lines 416–434 on 91334b7fa5748e15146a231bb0caf79c2016d1306d7a015a93c7b355fdcec845. Every change that wrote or deleted one of these lines, or deleted a line from between them. Exact, because each line keeps its identity across edits; edits elsewhere in the file are not here. Also: oxy log -L 416,434:src/cli/mcp.rs.