feat(altair): implement heatmap-correlation#65
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Implements correlation heatmap visualization using altair's mark_rect. Creates a correlation matrix from numeric columns with annotations. - Supports pearson, spearman, and kendall correlation methods - Includes cell annotations with correlation values - Uses diverging colormap centered at 0 - Optional upper triangle masking - Proper input validation and error handling 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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Summary
Implements
heatmap-correlationfor altair library.Parent Issue: #53
Sub-Issue: #58
Attempt: 1/3
Implementation
plots/altair/rect/heatmap-correlation/default.pyFeatures
mark_rect()Testing
Successfully tested with sample data:
Visual Output