spec: add scatter-basic specification

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New Specification: scatter-basic

Closes #611

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specification.md

scatter-basic: Basic Scatter Plot

Description

A fundamental 2D scatter plot that displays the relationship between two numeric variables by plotting points on a Cartesian coordinate system. This visualization is essential for exploring correlations, identifying patterns, detecting outliers, and understanding the distribution of paired data points.

Applications

• Analyzing the correlation between height and weight in a health study
• Exploring the relationship between marketing spend and sales revenue
• Investigating the connection between study hours and exam scores

Data

• x (numeric) - Independent variable values plotted on the horizontal axis
• y (numeric) - Dependent variable values plotted on the vertical axis
• Size: 50-500 points recommended for clear visualization
• Example: Random correlated data with noise to demonstrate typical scatter patterns

Notes

• Points should have moderate transparency (alpha ~0.7) to reveal overlapping data
• Include axis labels and a descriptive title
• Grid lines help with value estimation
• Consider point size that balances visibility with overlap clarity

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