Group language manuals into function and keyword directories

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

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+% CPSC-KEYWORD-CLASS(7)
+
+# NAME
+
+cpsc-keyword-class - define a class with public and private fields
+
+# SYNOPSIS
+
+```text
+CLASS name
+    PUBLIC field : type
+    PRIVATE field : type
+ENDCLASS
+```
+
+# DESCRIPTION
+
+Declare a class at top level with at least one field. Every field explicitly
+requires PUBLIC or PRIVATE, without DECLARE. This differs from guide
+section 10's default-public rule. ENDCLASS closes the declaration.
+
+Classes use record value semantics: zero initialization, whole-value copying,
+arrays, pointers, and ordinary function/procedure parameters. Only PUBLIC
+fields can be accessed externally. PRIVATE fields still initialize and copy
+with the whole value. Methods, constructors, destructors, NEW, INHERITS,
+and array fields are unsupported.
+
+# EXAMPLE
+
+```text
+CLASS Person
+    PUBLIC Name : STRING
+    PRIVATE Age : INTEGER
+ENDCLASS
+DECLARE PersonValue : Person
+PersonValue.Name <- "Alice"
+OUTPUT PersonValue.Name
+```
+
+# SEE ALSO
+
+[cpsc-language-overview(7)](../cpsc-language-overview.7.md), [cpsc-keyword-type(7)](cpsc-keyword-type.7.md), [cpsc-keyword-declare(7)](cpsc-keyword-declare.7.md).
+