Document supported pseudocode with section 7 language manuals

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

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+% CPSC-FUNCTION-LCASE(7)
+
+# NAME
+
+cpsc-function-lcase - convert text to lower case
+
+# SYNOPSIS
+
+```text
+LCASE(text : STRING) RETURNS STRING
+```
+
+# DESCRIPTION
+
+Return a copy with letters converted to lower case. Unlike guide section 5.5's
+CHAR-to-CHAR signature, cpsc accepts text and returns STRING. Use ASCII
+text for predictable character conversion.
+
+# EXAMPLE
+
+```text
+OUTPUT LCASE("HELLO")
+```
+
+# SEE ALSO
+
+[cpsc-language-overview(7)](cpsc-language-overview.7.md), [cpsc-function-ucase(7)](cpsc-function-ucase.7.md).
+