CC-adoption backlog clear-out

After v8.16.0 the only backlog left was 2.1.140–147 verify/doc issues. A 3-agent workflow (debug-investigator + Explore) assessed each — and found the two "fix" items need no code change, only docs. Click an item.

assessed 9

do (doc) 4

close-out 4

defer 1

code fixes 0