feat(text): Text.to_float; a void function's return <value> is an error

Text.to_float reads a leading decimal number (strtod), the twin of Text.to_int, for data files.
A return with a value in a function that returns nothing now says so where it is, instead of
reaching clang as 'store void'. Seed regenerated.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/language/text/text-to_float.md

@@ -0,0 +1,27 @@
+---
+id: text-to_float
+name: Text.to_float
+category: text
+kind: namespace-method
+tokens: Text.to_float
+sig: Text.to_float(s) -> float
+tip: Parse a leading decimal number from a string.
+order: 11
+ns: Text
+member: to_float
+---
+
+Reads an optional sign, the leading digits, a decimal point and an exponent from <code>s</code> and returns them as a <code>float</code>, stopping at the first character that cannot continue a number - so <code>Text.to_float("0.25 m")</code> is <code>0.25</code>. A string with no leading number yields <code>0.0</code>. It is the float twin of <code>Text.to_int</code>, for reading a data file or a typed value.
+
+Parameters:
+- `s` — the string to parse
+
+```ludic
+program ParseSpeed {
+  var typed: string = "3.2"
+
+  handler Apply phase Update {
+    let speed = Text.to_float(typed)   # 3.2
+  }
+}
+```