Document supported pseudocode with section 7 language manuals

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

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diff --git a/doc/language/cpsc-keyword-output.7.md b/doc/language/cpsc-keyword-output.7.md
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+% CPSC-KEYWORD-OUTPUT(7)
+
+# NAME
+
+cpsc-keyword-output - print values to standard output
+
+# SYNOPSIS
+
+```text
+OUTPUT expression, ...
+```
+
+# DESCRIPTION
+
+Print expressions from left to right without automatic separators, then add
+a newline. Strings print their contents; BOOLEAN prints TRUE or FALSE.
+Whole arrays and partially indexed arrays print their elements one per line;
+a final array adds no extra newline. Records, classes, and pointers cannot
+be printed directly.
+
+# EXAMPLE
+
+```text
+DECLARE Score : INTEGER
+Score <- 10
+OUTPUT "Score: ", Score
+```
+
+# SEE ALSO
+
+[cpsc-language-overview(7)](cpsc-language-overview.7.md), [cpsc-keyword-input(7)](cpsc-keyword-input.7.md), [cpsc-keyword-declare(7)](cpsc-keyword-declare.7.md).
+