Replace built-in strcmp chains with dispatch table in functions.c

Extract each of the 21 built-in function handlers (assert, decr, double,
end, exit, fork, gc, incr, ind, integer, len, ln, neg, no, not, put,
refs, say, scope, string, yes) into individual static _builtin_XXX()
functions, each focused on a single responsibility.

Add a null-terminated BuiltinEntry g_builtins[] dispatch table mapping
name strings to handler function pointers.  Rewrite function_is_buildin()
and function_process_buildin() to iterate the table instead of
maintaining parallel 21-branch strcmp chains.

This satisfies OCP (adding a built-in only requires a new table row),
SRP (each handler owns exactly one built-in's logic), and DRY (name
lookup done in one place).  The array special-case (len/ind on TT_ARRAY
vs element-wise iteration) is preserved inline before the table dispatch.

Also add missing NO_DEFAULT; to _builtin_say's switch for style
consistency with all other handlers.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

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