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-mid.7.md b/doc/language/function/cpsc-function-mid.7.md
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+% CPSC-FUNCTION-MID(7)
+
+# NAME
+
+cpsc-function-mid - extract part of a string
+
+# SYNOPSIS
+
+```text
+MID(text : STRING, start : INTEGER, count : INTEGER) RETURNS STRING
+```
+
+# DESCRIPTION
+
+Return up to count bytes starting at the one-based position start.
+Positions below 1 clamp to 1; positions beyond the end return an empty string.
+The count clamps to the available bytes; negative counts return an empty string.
+
+# EXAMPLE
+
+```text
+OUTPUT MID("ABCDEFGH", 2, 3)
+```
+
+# SEE ALSO
+
+[cpsc-language-overview(7)](../cpsc-language-overview.7.md), [cpsc-function-left(7)](cpsc-function-left.7.md), [cpsc-function-right(7)](cpsc-function-right.7.md), [cpsc-function-length(7)](cpsc-function-length.7.md).
+