* feat(cli): mark duplicates from issue status and issue update (MUL-7821)
Add --duplicate-of to `multica issue status` and `multica issue update`.
It resolves an issue key or UUID and sends duplicate_of_issue_id, which
the server already accepts (MUL-7349). The CLI rejects a status other than
cancelled, and description or attachment changes, before any request or
upload. It fails when the response has no duplicate_of field, so a server
older than v0.5.2 cannot silently drop the mark.
Closes#8974
Co-authored-by: multica-agent <[email protected]>
* docs: teach agents to mark duplicates with --duplicate-of (MUL-7821)
Add the command to the agent runtime brief, the multica-platform issues
reference, CLI_AND_DAEMON.md and the CLI docs tables, so agents record the
mark instead of cancelling a duplicate and explaining it in a comment.
Co-authored-by: multica-agent <[email protected]>
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Co-authored-by: multica-agent <[email protected]>
