Add a `seed-demo` subcommand (cmd/seed_demo.go + internal/demoseed/)
that inserts a fixed reference catalog into the member-console DB so
the operator panel has rows to walk through for UX research. Catalog:
6 demo-* products (4 by product_type + 2 extra plans), 1 plan ladder
with 3 tiers, 1 entitlement set with 2 rules (limit + boolean), and 1
grant on Alice's personal org (once she's logged in).
Person rows for bob/carlos/diana are seeded via provisioning.AutoProvision
keyed on the pinned Keycloak UUIDs — no longer fragile now that
seed-keycloak.sh's partialImport switch preserves the pinned id. Alice
is intentionally NOT pre-seeded so the lazy-creation OIDC flow stays
exercised on every fresh stack.
Idempotency: list+filter by `name` for catalog rows, by `oidc_subject`
for persons. Re-running is a no-op for created rows; warns + skips
the grant if alice hasn't logged in yet.
Host-side invocation only — run `./test/seed-demo.sh` after
bootstrap-stack.sh. Mirrors how member-console itself runs on the
host (config + secrets live under test/).
Two OpenSpec changes folded in: 2026-05-10-member-console-demo-seeder
(the seeder) and 2026-05-11-demo-seeder-persons (the persons follow-up
unlocked by the Keycloak fix).