Maity: Board

Re-verify #169, #160, #162 third round (security)

tsk-vqzp3xsghd75 cancelled

Heads: #169 a4dbb38, #160 4824e2c, #162 f043867. Read your r3 findings and the Contract owner: third round comments. Check fixes + listed interpretations; new holes against §2.3 humans_only. Result per PR as review_result.