Document supported pseudocode with section 7 language manuals

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

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+% CPSC-KEYWORD-OPENFILE(7)
+
+# NAME
+
+cpsc-keyword-openfile - open a text file
+
+# SYNOPSIS
+
+```text
+OPENFILE filename FOR READ
+OPENFILE filename FOR WRITE
+OPENFILE filename FOR APPEND
+```
+
+# DESCRIPTION
+
+The filename is a STRING expression. READ opens an existing file for reading;
+WRITE creates or truncates a file; APPEND writes at the end, creating the file
+if needed. READ, WRITE, APPEND, and this use of FOR belong here.
+
+At most 16 files may be open at once. Use the same filename string for
+subsequent operations. Reopening an open filename, failed opens, and wrong-mode
+operations terminate execution with a fatal diagnostic. RANDOM is reserved
+but unsupported.
+
+# EXAMPLE
+
+```text
+OPENFILE "notes.txt" FOR WRITE
+WRITEFILE "notes.txt", "Hello"
+CLOSEFILE "notes.txt"
+```
+
+# SEE ALSO
+
+[cpsc-language-overview(7)](cpsc-language-overview.7.md), [cpsc-keyword-readfile(7)](cpsc-keyword-readfile.7.md), [cpsc-keyword-writefile(7)](cpsc-keyword-writefile.7.md), [cpsc-keyword-closefile(7)](cpsc-keyword-closefile.7.md).
+