CWG1670 auto as conversion-type-id

Considering reflector traffic, parts of CWG appear to be gravitating towards making declarations of "operator auto" ill-formed.

Soliciting EWG approval of that direction.

See CWG1670 for details.

EWG discussed this in Kona on Friday afternoon and took the following polls:

CWG1670: EWG agrees with CWG's direction of making use of placeholders in conversion-type-ids ill-formed

SF	F	N	A	SA
15	10	0	1	0

consensus.

CWG1670: EWG would like to resolve CWG1670 by deprecating use of placeholders in conversion-type-ids in either C++26 or C++29, at CWG's discretion

SF	F	N	A	SA
2	7	5	5	5

not consensus.

CWG 2025-11-07: Approved CWG1670 for plenary vote.

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