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-closefile.7.md b/doc/language/cpsc-keyword-closefile.7.md
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+% CPSC-KEYWORD-CLOSEFILE(7)
+
+# NAME
+
+cpsc-keyword-closefile - close a text file
+
+# SYNOPSIS
+
+```text
+CLOSEFILE filename
+```
+
+# DESCRIPTION
+
+Close the file associated with this filename string and release its open-file
+slot. Closing a filename that is not open terminates execution.
+
+# EXAMPLE
+
+```text
+OPENFILE "notes.txt" FOR WRITE
+WRITEFILE "notes.txt", "Done"
+CLOSEFILE "notes.txt"
+```
+
+# SEE ALSO
+
+[cpsc-language-overview(7)](cpsc-language-overview.7.md), [cpsc-keyword-openfile(7)](cpsc-keyword-openfile.7.md), [cpsc-keyword-readfile(7)](cpsc-keyword-readfile.7.md), [cpsc-keyword-writefile(7)](cpsc-keyword-writefile.7.md).
+