Cutover tasks were scattered across three sources that disagreed with each
other and with reality: planning/parity-checklist.md (git-ignored, content
only), docs/seo-aeo-optimization.md (SEO only, listed the Zod schema,
seo-lint and breadcrumbs as open when all three are done, and called for
Uptime Kuma which ADR-0004 replaced with monylog), and session notes.
Add docs/launch-checklist.md as the single source of truth, verified against
the working tree, the cluster and ArgoCD rather than inherited from the older
docs. Point the SEO doc's two checkbox blocks at it and keep only reference
detail there.
Also records blockers that were not tracked anywhere: TLS never wired on the
ingress, developer-facing copy rendered on the contact page, the contact form
having no endpoint, and the draft insight post building into the sitemap
because the draft flag is declared in Zod but never filtered on.
