Add final demo visualizations

Generated three demo visualizations showing all bumplot improvements:
- Small example (20 particles)
- Medium complexity (50 particles)
- High divergence (100 particles)

Demonstrates all fixes: no overshooting, no gaps, proper bounds,
transparency, readable labels, and improved layout.

Author: jeremymanning

code/bumplot_final/final_demo_divergent.png

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+#!/usr/bin/env python3
+"""Generate final demo showing all bumplot improvements."""
+
+import sys
+sys.path.insert(0, '/Users/jmanning/quantum-conversations/code')
+
+from quantum_conversations import ParticleFilter, TokenSequenceVisualizer, ModelManager
+import matplotlib.pyplot as plt
+from pathlib import Path
+
+# Create output directory
+output_dir = Path("bumplot_final")
+output_dir.mkdir(exist_ok=True)
+
+print("Generating final demo visualizations with all improvements...")
+print("=" * 60)
+
+model_manager = ModelManager()
+
+# Test Case 1: Small example to see all improvements clearly
+print("\n1. Small example (20 particles)")
+pf = ParticleFilter(
+    model_name="EleutherAI/pythia-70m",
+    n_particles=20,
+    temperature=0.7,
+    device="cpu",
+    model_manager=model_manager,
+    seed=42
+)
+
+particles = pf.generate("The future is", max_new_tokens=10)
+viz = TokenSequenceVisualizer(tokenizer=pf.tokenizer)
+
+fig = viz.visualize_bumplot(
+    particles,
+    output_path=str(output_dir / "final_demo_small.png"),
+    max_vocab_display=8,
+    show_tokens=True,
+    colormap='RdYlGn',
+    figsize=(16, 10)
+)
+plt.close(fig)
+print(f"✓ Saved: {output_dir}/final_demo_small.png")
+
+# Test Case 2: Medium complexity to show transparency
+print("\n2. Medium complexity (50 particles)")
+pf = ParticleFilter(
+    model_name="EleutherAI/pythia-70m",
+    n_particles=50,
+    temperature=0.8,
+    device="cpu",
+    model_manager=model_manager,
+    seed=42
+)
+
+particles = pf.generate("Hello world", max_new_tokens=12)
+viz = TokenSequenceVisualizer(tokenizer=pf.tokenizer)
+
+fig = viz.visualize_bumplot(
+    particles,
+    output_path=str(output_dir / "final_demo_medium.png"),
+    max_vocab_display=10,
+    show_tokens=True,
+    colormap='RdYlGn',
+    figsize=(16, 10)
+)
+plt.close(fig)
+print(f"✓ Saved: {output_dir}/final_demo_medium.png")
+
+# Test Case 3: High divergence
+print("\n3. High divergence (100 particles)")
+pf = ParticleFilter(
+    model_name="EleutherAI/pythia-70m",
+    n_particles=100,
+    temperature=1.2,
+    device="cpu",
+    model_manager=model_manager,
+    seed=42
+)
+
+particles = pf.generate("Once upon a", max_new_tokens=12)
+viz = TokenSequenceVisualizer(tokenizer=pf.tokenizer)
+
+fig = viz.visualize_bumplot(
+    particles,
+    output_path=str(output_dir / "final_demo_divergent.png"),
+    max_vocab_display=12,
+    show_tokens=True,
+    colormap='RdYlGn',
+    figsize=(18, 10)
+)
+plt.close(fig)
+print(f"✓ Saved: {output_dir}/final_demo_divergent.png")
+
+print("\n" + "=" * 60)
+print("ALL IMPROVEMENTS IMPLEMENTED:")
+print("=" * 60)
+print("✓ No overshooting (sigmoid transitions)")
+print("✓ No gaps (overlapping segments)")
+print("✓ No out-of-range curves (clamped to max_vocab_display)")
+print("✓ Clear transparency (alpha=0.1)")
+print("✓ Uniform font size (12pt, 10pt for long tokens)")
+print("✓ Opaque token backgrounds")
+print("✓ Smart text colors (white/black based on background)")
+print("✓ Large axis labels (18pt)")
+print("✓ Large tick labels (14pt)")
+print("✓ Colorbar at x=0.88 with 0%/100% labels")
+print("✓ Proper y-axis padding (0.3 to max+0.8)")
+print("✓ Max token length 15 chars")
+print("\nFinal visualizations saved to: bumplot_final/")