History of signer_line 1 change

In src/cli/mcp.rs, lines 416–434 on 232aabb5452d64b37861ebe61aaabacb012e4ae041f141bc0a51e00d4c8986a5. 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.