seed: curriculum content

1.solar-system/3.strings/0.index.md

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+---
+type: module
+title: "Strings"
+description: "Text is half of every program — index it, slice it, transform it, count it, format it."
+---
+
+# Strings
+
+Half of what programs do is move text around. Reading user input,
+formatting reports, parsing log lines, validating passwords — all
+strings. This module hands you the toolkit.
+
+Seven blocks. About three and a half hours. No conditionals or loops
+yet — those come next module — so every challenge here works through
+indexing, slicing, methods, and built-in functions.
+
+## What You'll Do
+
+- Index and slice strings
+- Apply the most-used string methods (`upper`, `strip`, `split`,
+  `replace`, ...)
+- Validate, count, mirror, and format text
+- Build a small mission report from raw fields
+
+## Pace
+
+About 3.5 hours. Each block is a small real program — no drills.