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-length.7.md b/doc/language/function/cpsc-function-length.7.md
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+% CPSC-FUNCTION-LENGTH(7)
+
+# NAME
+
+cpsc-function-length - find a string's length
+
+# SYNOPSIS
+
+```text
+LENGTH(text : STRING) RETURNS INTEGER
+```
+
+# DESCRIPTION
+
+Return the number of bytes before the string terminator. String operations
+are byte-based, so this is not a Unicode character count.
+
+# EXAMPLE
+
+```text
+OUTPUT LENGTH("Hello")
+```
+
+# SEE ALSO
+
+[cpsc-language-overview(7)](../cpsc-language-overview.7.md), [cpsc-function-mid(7)](cpsc-function-mid.7.md), [cpsc-function-left(7)](cpsc-function-left.7.md), [cpsc-function-right(7)](cpsc-function-right.7.md).
+