add split asteroids

tasks/asteroid-splitting/docs/asteroid-splitting-1.md

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+# Asteroid Splitting — Document 1
+
+## Overview
+
+Four pages of asteroid splitting exercises. Each page has 3 sections with decorative dividers and even vertical spacing. The child splits each number into two unequal parts.
+
+## Page 1
+
+- Hero: splitter3 (right side)
+- Footer: cabin1
+- Divider style: construction tape (yellow/brown)
+- Sections: N=9(6rows, asteroid5), N=7(5rows, asteroid3), N=6(3rows, asteroid1)
+
+## Page 2
+
+- Hero: splitter6 (left side)
+- Footer: cabin3
+- Divider style: police tape (blue/white)
+- Sections: N=8(5rows, asteroid6), N=5(3rows, asteroid2), N=4(3rows, asteroid4)
+
+## Page 3
+
+- Hero: splitter2 (right side)
+- Footer: cabin5
+- Divider style: metal beam (gray gradient)
+- Sections: N=10(6rows, asteroid8), N=8(5rows, asteroid4), N=3(1row, asteroid6)
+
+## Page 4
+
+- Hero: splitter8 (left side)
+- Footer: cabin7
+- Divider style: metal truss (dark gray zigzag)
+- Sections: N=9(6rows, asteroid3), N=7(5rows, asteroid1), N=5(3rows, asteroid2)
+
+## Divider Styles Used
+
+1. construction tape (page 1)
+2. police tape (page 2)
+3. metal beam (page 3)
+4. metal truss (page 4)
+
+## Layout Notes
+
+- 3 sections per page with `justify-evenly` for even vertical distribution
+- Row counts: 9-10→6, 7-8→5, 4-6→3, 1-3→1
+- Splitter icon 36mm wide, pointing right
+- Footers: cabin views (not planets)