Group language manuals into function and keyword directories

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

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diff --git a/doc/language/function/cpsc-function-str_to_num.7.md b/doc/language/function/cpsc-function-str_to_num.7.md
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+% CPSC-FUNCTION-STR_TO_NUM(7)
+
+# NAME
+
+cpsc-function-str_to_num - convert text to a real number
+
+# SYNOPSIS
+
+```text
+STR_TO_NUM(text : STRING) RETURNS REAL
+```
+
+# DESCRIPTION
+
+Return REAL, including for integer-looking text. Conversion can stop at
+trailing text; invalid text returns zero. Use IS_NUM first when the whole
+string must be a valid number.
+
+# EXAMPLE
+
+```text
+OUTPUT STR_TO_NUM("12.5")
+```
+
+# SEE ALSO
+
+[cpsc-language-overview(7)](../cpsc-language-overview.7.md), [cpsc-function-is_num(7)](cpsc-function-is_num.7.md), [cpsc-function-num_to_str(7)](cpsc-function-num_to_str.7.md).
+