- buildSshTarget rejects destinations beginning with "-" (SSH argument-injection / local RCE guard)
- gate ssh:// read/search/write at the exec approval tier; substring scan covers search's pre-expansion delimited paths and write's hashline-wrapped paths
- validate the entire materialized buffer as UTF-8 instead of only the first 8 KiB prefix
- write peels read selectors (raw/conflicts) so it targets the same file read does, and rejects line-range/malformed selectors instead of silently stripping them
- write to a uniquely named remote temp; document symlink-replacement on write as a v1 limit
can1357