fix(lint): calibrate register-clobber to the Go ABI and add legacy SSE moves

Assisted-by: Qwen 3.8 Max Preview

format/format.go

@@ -99,6 +99,12 @@ func Source(path, src string) string {
 			}
 		case kInstr:
 			out = renderInstr(line, maxWidth[inf.funcID])
+			// A RET ends the body for indentation purposes: comments that
+			// follow it — typically the next function's doc comment — belong
+			// at column 0, not inside the finished function.
+			if strings.EqualFold(line[0].Text, "RET") {
+				inBody = false
+			}
 		}
 		b.WriteString(strings.TrimRight(out, " \t"))
 		b.WriteByte('\n')