Agents were being woken immediately when an issue was created or
reassigned with status "backlog", defeating the purpose of backlog
as "not ready to work on yet" (issue #96).
Added `&& issue.status !== "backlog"` guard to both the CREATE and
PATCH wakeup paths, mirroring the existing done/cancelled suppression
pattern already present in the file.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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