PHASE9_1_STRIPE_TEST_VALIDATION.md rewritten from BLOCKED to the real, proven results: a real
Stripe TEST Checkout, a real TEST payment at the founder-approved $399 Founding Cohort price, a
genuine signed webhook, the existing registration->enrollment conversion, a real
duplicate-delivery proof, a real automated abandoned-checkout proof, a real refund with the
non-cascade rule reconfirmed, full Stripe<->RootNode reconciliation IDs, and the one real defect
found and fixed. STRIPE_INTEGRATION_RUNBOOK.md updated (real-Stripe local testing is no longer
'not yet exercised'; notes the no-sudo Stripe CLI install path and --api-key/--print-secret
usage). WINTER_BREAK_LAUNCH_CHECKLIST.md: Stripe TEST validation checked, price checked ($399
launch / $449 retail per Chase directly), live-mode items correctly still unchecked.
PHASE9_COMMERCE_AND_LAUNCH.md's Phase 9.1 addendum updated to reflect completion.
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