A heredoc body always ends in a newline, so on the heredoc-stdin backends
(Modal, Daytona, Vercel) every stdin payload arrived with one extra byte.
write_file and patch verify an exact sha256 of the written file, so even
with the command grouped every write failed verification and left
content + "\n" on disk.
Feed the heredoc through a process substitution that re-emits the body
minus that last character. The heredoc stays outside <( ) because bash
3.2 mis-parses heredoc bodies inside it, and the reader tolerates read's
EOF status under an inherited set -e.
The tool-result spill no longer needs its +1 byte allowance for heredoc
mode, so the size check is exact on every backend again.
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