Add label rendering support to NetworkModule

[Tejasv-Singh]

Summary

The label key in node portrayals was accepted but never rendered. This adds text elements positioned at node centers.

Changes

• Added labels SVG group for text elements
• Text labels are centered using text-anchor: middle and dominant-baseline: middle
• Dynamic font sizing based on node size (size * 1.5 px)
• Optional label_color property (defaults to black)

Usage

portrayal['nodes'].append({
    'size': 12,
    'color': '#CC0000',
    'label': str(agent.value),        # NEW: renders text on node
    'label_color': '#FFFFFF',         # NEW: optional, defaults to black
})

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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