Apple export integration unavailable

The Mac-agent build/sign/verify path is an explicit implementation stub. Doctor reports a warning, but actual macOS/iOS exports fail even when macAgent is configured.

#Common causes

• The Mac session has not supplied and integrated ara-export-agent build, signing and verification support.

#Fixes

• Implement and integrate the Mac-agent workflow described in crates/ara-export/README.md; changing SDK paths alone cannot enable this lane.

• Use ssh <mac-agent> ara-export-agent --capabilities to check the agent contract while integrating it.

• Code: ARA-EXP-APL-002 (slot 8075)

• Constant: export::APL_002

• Reported by: ara-export