Marks all four Warning findings from 16-REVIEW.md as resolved with their
fix commit hashes; the two Info findings (IN-01/IN-02) remain open and
out of scope for this fix pass. Appends a note to 16-03-SUMMARY.md
recording the WR-02/WR-03/WR-04 behavior change in
syncBoundGroupsForTenant(), since that summary still described the
pre-fix behavior.
schalli