Document supported pseudocode with section 7 language manuals

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

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+% CPSC-KEYWORD-MOD(7)
+
+# NAME
+
+cpsc-keyword-mod - find the integer division remainder
+
+# SYNOPSIS
+
+```text
+left MOD right
+```
+
+# DESCRIPTION
+
+Both operands must be INTEGER. Return the remainder after division truncated
+toward zero; a nonzero remainder has the dividend's sign.
+A zero divisor terminates execution. MOD has the same precedence as
+multiplication.
+
+# EXAMPLE
+
+```text
+OUTPUT 7 MOD 2
+```
+
+# SEE ALSO
+
+[cpsc-language-overview(7)](cpsc-language-overview.7.md), [cpsc-keyword-div(7)](cpsc-keyword-div.7.md).
+