Document supported pseudocode with section 7 language manuals

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

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+% CPSC-KEYWORD-FOR(7)
+
+# NAME
+
+cpsc-keyword-for - iterate over an integer range
+
+# SYNOPSIS
+
+```text
+FOR variable <- start TO finish [STEP increment]
+    statements
+NEXT variable
+```
+
+# DESCRIPTION
+
+The loop variable must already be declared INTEGER. Both endpoints are
+inclusive. STEP defaults to 1; use a negative value to count down.
+STEP is evaluated once, while the finish expression is evaluated each
+iteration. NEXT must name the same variable. Use a nonzero STEP.
+TO, STEP, and NEXT belong to this syntax.
+
+# EXAMPLE
+
+```text
+DECLARE Index : INTEGER
+FOR Index <- 3 TO 1 STEP -1
+    OUTPUT Index
+NEXT Index
+```
+
+# SEE ALSO
+
+[cpsc-language-overview(7)](cpsc-language-overview.7.md), [cpsc-keyword-declare(7)](cpsc-keyword-declare.7.md), [cpsc-keyword-while(7)](cpsc-keyword-while.7.md).
+