feat: add config presets for colored numerals and skip counting

- Add colored-numerals.yaml for place-value with colored text
- Add count-by-5s.yaml for skip counting example
- Demonstrate new features with ready-to-use configs

🤖 Generated with Claude Code

Co-Authored-By: Claude <noreply@anthropic.com>

config/colored-numerals.yaml

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+# Configuration with colored numerals to match bead colors
+# This makes it easy for learners to connect the visual representation
+# with the numerical value, especially for place value understanding
+range: "0-999"
+cards_per_page: 6
+paper_size: "us-letter"
+orientation: "portrait"
+margins:
+  top: "0.5in"
+  bottom: "0.5in"
+  left: "0.5in"
+  right: "0.5in"
+gutter: "5mm"
+show_cut_marks: true
+show_registration: false
+font_family: "DejaVu Sans"
+font_size: "48pt"
+columns: 3
+show_empty_columns: true
+hide_inactive_beads: false
+bead_shape: "diamond"
+color_scheme: "place-value"
+colored_numerals: true  # Color the numerals to match the bead colors
+shuffle: false

config/count-by-5s.yaml

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+# Configuration for counting by 5s
+# Useful for practicing skip counting and multiplication tables
+range: "0-100"
+step: 5  # Count by 5s: 0, 5, 10, 15, 20, ...
+cards_per_page: 6
+paper_size: "us-letter"
+orientation: "portrait"
+margins:
+  top: "0.5in"
+  bottom: "0.5in"
+  left: "0.5in"
+  right: "0.5in"
+gutter: "5mm"
+show_cut_marks: true
+show_registration: false
+font_family: "DejaVu Sans"
+font_size: "48pt"
+columns: auto
+show_empty_columns: false
+hide_inactive_beads: false
+bead_shape: "diamond"
+shuffle: false