Spread an item or a message into a record or a send, and set an item whole

Adding one field to the board two nodes share (Pure's research 105)
still meant the record, the output, three sends and the code applying
what the other node sent: the sends and the apply named every field.

..source, last in a record value's or a send's braces, gives the fields
not written from the source's fields of the same names: an item (an
index, a let, the item a for walks, list[key]) or the handler's message
(grouped fields by their paths). A record value gives what the source
lacks its default; a send still needs every field. list[i] = Record {
... } sets every field of the item, all of them given; a keyed list's
key does not change, so a value with another key fails the event
(limit) and changes nothing.

Both are the fields written out: the checks compare the modules byte
for byte, and run the key rule in pure-run. Seven diagnostics: a spread
not last, a source that is no item nor this handler's message (also
another handler's message), a spread inside a send's group, a send
field left empty, a whole item missing a field, a value that is no
record. The board now sends { ..at } and applies cards[k] = Card {
..remote }: a new field is written in two places, the record and the
output.

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