docs(phase5c): enrollment communications documentation + Google Workspace runbook

- PHASE5C_ENROLLMENT_COMMUNICATIONS.md: the full design doc.
- RUNBOOK_GOOGLE_WORKSPACE_EMAIL.md: every REQUIRES GOOGLE WORKSPACE ADMIN ACTION step
  (mailbox, service account, domain-wide delegation scoped to gmail.send only, SPF/DKIM/DMARC),
  environment variables, testing procedure, production secret handling, rotation, revocation,
  troubleshooting, quotas.
- RUNBOOK_STUDENT_ACTIVATION.md: day-to-day operation of the pipeline from /admin.
- WEBSITE_ENROLLMENT_INTEGRATION.md: explicit website-vs-RootNode responsibility boundary,
  the new contact_email field, and closes the 'RootNode doesn't send activation email yet'
  known limitation this doc previously documented.
- RUNBOOK_SELF_PACED_ENROLLMENT.md, RUNBOOK_STUDENT_ACCOUNT_LIFECYCLE.md: point at the new
  automatic-email behavior and the Resend activation control.
- REMOTE_AND_SELF_PACED_ARCHITECTURE.md, ENGINEERING_SOP.md: close the enrollment-
  communication gap; new ENGINEERING_SOP §16.
- PRODUCTION_VALIDATION_CHECKLIST.md, README.md, platform/README.md: cross-references and a
  Phase 5C production-validation section.
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@@ -80,11 +80,18 @@ this flow specifically — see the Phase 4.1 report for the full run results.
entitlement (pending/future/expired/cancelled), server-derived completion, and the resulting
self-paced student dashboard.
6. ~~**No enrollment communication.**~~ **Closed in Phase 5C.** An enrolled student now actually
gets told — real activation/enrollment-confirmation/password-reset email, delivered
asynchronously through a provider-neutral notification worker (Google Workspace via the
Gmail API in production, a deterministic dev provider everywhere else). See
`docs/PHASE5C_ENROLLMENT_COMMUNICATIONS.md`.
## What Phase 4.1 deliberately did NOT do here
No signup flow, no student password/email auth implementation, no per-student curriculum
assignment route, no payments, no public course catalog, no held/premium scenario content. All
explicit non-goals per this phase's authorization. Student authentication (Phase 5A) and the
self-paced enrollment/entitlement model (Phase 5B) have both since been built; a public
self-registration *page*, real payment processing, and a Parent/Guardian portal remain
deliberately out of scope — see `docs/PHASE5B_SELF_PACED_ENROLLMENT.md` §12.
explicit non-goals per this phase's authorization. Student authentication (Phase 5A), the
self-paced enrollment/entitlement model (Phase 5B), and enrollment/account-lifecycle
communication (Phase 5C) have all since been built; a public self-registration *page*, real
payment processing, and a Parent/Guardian portal remain deliberately out of scope — see
`docs/PHASE5B_SELF_PACED_ENROLLMENT.md` §12 and `docs/PHASE5C_ENROLLMENT_COMMUNICATIONS.md`.