A failed builtin's err replaces its msg, and (xN) is a running total

A builtin failing a ctl write logged its Verbose announcement, its words as
a msg, and the write's err, so the same failure again never repeated the
newest record and never collapsed. Its err alone is logged now (the msg is
still shown and kept in +Messages). A repeat of a record a follower has
read is a new line with the running total, (xN) being N in all. fs.md
states both rules.

Co-Authored-By: Claude Opus 5.5 <[email protected]>

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