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The §9 pipeline's PPE+E2E stage was unreachable: e2e/metadata.spec.js was bound to Tier-1-only scaffolding (docker-seeded faceted collection, SQLite-injected owner, Mailpit OTC sink). This makes the same suite run against a deployed host. - backend: POST /auth/test/login — fail-closed, secret-gated, single- identity owner test-login (404 unless E2E_TEST_AUTH_SECRET + E2E_TEST_AUTH_EMAIL both set; constant-time compare; loud startup warn). 6 vertical tests; backend 665 green. Documented in backend/.env.example. - e2e/lib/auth.js: branch on E2E_TEST_AUTH_SECRET (deployed test-login vs local Mailpit OTC); OWNER_EMAIL from E2E_OWNER_EMAIL. Spec unchanged so the localhost Tier-1 path keeps working. - testing/seed-ppe.sh: seed a dedicated, prod-untouching PPE registry + content repo (faceted bdd collection) — real OHM content never touched. - docs/design/2026-06-07-deployed-env-e2e-harness.md; CHANGELOG; VERSION + frontend/package.json -> 0.52.0. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>