feat(questionnaires): F9.4 demo-content seed + F9.2 operational runbook

[JohnD-EE]

Summary

Two P9 deliverables on one branch (F9.4 built first so the F9.2 runbook can exercise it).

F9.4 — Demo content seed (DEMO-ONLY)

A one-command seed (prisma/seeds/app-questionnaire/025-demo-content.ts) that takes a fresh DB from nothing to something demo-able, no admin clicks:

• Populates a believable "Northwind Logistics (Demo)" demo client (branded: CTA/accent colors, logo, welcome copy) plus a fully launched, attributed sample questionnaire.
• Env-gated, off by default — no-ops unless LOAD_DEMO_CONTENT=1, so it can never load in production. The gate lives inside run() so the runner still stamps SeedHistory on the no-op.
• Idempotent — re-running finds-and-replaces the demo questionnaire (keyed on a stable title) and upserts the client by slug; no duplicates.
• Reuses the real persistence seam — writes the section/slot graph through writeGraph (the same path the ingestion route uses), not hand-rolled inserts.
• Fork-clean — the whole file is marked DEMO-ONLY; a fork strips it via grep -rl "DEMO-ONLY". Nothing imports it (glob-discovered), so deletion is clean.

F9.2 — Operational runbook

.context/app/questionnaire/runbook.md — a road-tested "spin up a demo client end-to-end" walkthrough taking a presenter from a fresh checkout to a respondent answering the first question: seeded fast path → branding → content (clone-first, upload-and-extract as alternative) → launch → invite → first session → reset. Cross-linked from demo-clients.md (the demo hub). Documentation only — no runtime capability.

Housekeeping

• Document LOAD_DEMO_CONTENT in .env.example (with the "didn't appear? clear SeedHistory" gotcha).
• Mark P0–P9 feature trackers done and refresh development-plan.md status.
• Add F9.2/F9.4 trackers (f9.2.md, f9.4.md).

Test plan

• npm run type-check passes.
• LOAD_DEMO_CONTENT=1 npm run db:seed on a fresh DB → Northwind demo client + launched questionnaire appear; re-seed produces no duplicates.
• npm run db:seed without the flag → no-op (no demo content).
• Walk the runbook end-to-end against the seeded content.

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