Document supported pseudocode with section 7 language manuals

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

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+% CPSC-FUNCTION-CHR(7)
+
+# NAME
+
+cpsc-function-chr - convert a byte code to text
+
+# SYNOPSIS
+
+```text
+CHR(code : INTEGER) RETURNS STRING
+```
+
+# DESCRIPTION
+
+Convert the low eight bits of code to a one-byte string.
+The result is STRING, not CHAR. Use ASCII codes 1 to 127 for
+ordinary text; code 0 produces an empty string.
+
+# EXAMPLE
+
+```text
+OUTPUT CHR(65)
+```
+
+# SEE ALSO
+
+[cpsc-language-overview(7)](cpsc-language-overview.7.md), [cpsc-function-asc(7)](cpsc-function-asc.7.md).
+