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-writefile.7.md b/doc/language/cpsc-keyword-writefile.7.md
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+% CPSC-KEYWORD-WRITEFILE(7)
+
+# NAME
+
+cpsc-keyword-writefile - write a line to a text file
+
+# SYNOPSIS
+
+```text
+WRITEFILE filename, expression
+```
+
+# DESCRIPTION
+
+Write one value as text followed by a newline. Open the file FOR WRITE or
+APPEND first. Exactly one data expression is accepted; join strings with
+`&` when needed. Records, classes, and pointers are unsupported as data.
+
+# EXAMPLE
+
+```text
+OPENFILE "notes.txt" FOR APPEND
+WRITEFILE "notes.txt", "Score: " & NUM_TO_STR(10)
+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-closefile(7)](cpsc-keyword-closefile.7.md), [cpsc-function-num_to_str(7)](cpsc-function-num_to_str.7.md).
+