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Populate the M1 banner's extension slot with the sysop deactivate CTA
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Description

Populate the M1 banner's extension slot with the sysop deactivate CTA (covered in more detail in the next sub-bullet).

The mainspace renderer is the code path that plugs the CTA into the slot the M1 banner ships empty; this bullet commits to the wiring, and the next sub-bullet owns the CTA's own behaviour.