An a, c or i text with no . line fails the Edit, as an open { does

sam takes the end of input as a text block's end, so a block cut short (a
write that lost its tail, an open closed early) inserted half of itself.
An Edit whose a, c or i text never meets its . line now fails with "a, c
or i text not ended by a . line" and changes nothing, as an unclosed {
does; at a close, logged as an err.

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

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