agent-send.sh -m with backticks executes them as command substitution: the recipient
got a mangled body plus a shell error, and the send still reported success. Same class
as the known pr-create.sh backtick bug — two tools in the comms path treating a
message body as shell input.
The failure mode is the mission's own pattern: silent corruption with a success
receipt.
Requirement on RM-40/RM-42: comms/v1 must carry payloads verbatim with no shell
interpretation at any hop, with a byte-identical round-trip test (backticks, command
substitution, quotes, newlines) registered under RM-02 including a must-fail control.
Co-Authored-By: Claude Opus 5 (1M context) <[email protected]>
