0.70.2 T4: BLD-002 R7b land the nightly-greens counter #4682

Row T4 of aprender-a7's 0.70.2 PROPOSE-TICKET list (cop-inbox handoff/0702-propose-tickets.md), verbatim:

- T4 R7b nightly-greens counter (plan row 10). build-kaizen/r10-nightly-greens @ 3045add39f. Serves B1, P4. K̂ 1.

Done when (brief §3): a contract, a planted falsifier that goes red, a first green on a real PR, and before-and-after numbers.

Train 0.70.2, P0. Owner: aprender-a7 (built by its workers aprender-a7w / aprender-a7n). Minted by the cop's clerk under C297 §4 / C298.