Add one-command Atrium resource replay for demos

[eamirian]

What changed

• adds a Vite-only replay seam for one immutable Intelligence resource-page artifact
• lets the real shared Atrium render a domain-generated page without a second API, store, or domain UI
• replaces persistence and schema language in the leadership-facing onboarding and degraded states
• extends the external-domain browser test through the real onboarding completion and first-Brief handoff
• reconciles the landed Core Bind Atrium to durable Intelligence Builder state #145 / World Recover provider runtime provenance and retry accounting #24 acceptance state

Why

The accepted World AI journey could generate the exact 23-resource page and Atrium could render it, but there was no simple way to experience those together. This closes that presentation gap while preserving the architecture boundary: Core owns Atrium; domains own resources.

Safety boundary

The replay exists only in the local Vite server when ACE_ATRIUM_RESOURCE_PAGE is explicitly set. It validates the public page contract, binds only loopback presentation requests, grants no authority, admits no evidence, creates no store, and is absent from the production canvas host.

Validation

• Canvas: 301 tests passed
• production Canvas build passed
• real World 23-resource page rendered in desktop and mobile Atrium
• external-page E2E exercised onboarding completion and first-Brief handoff
• visual QA passed against the established Linear/Rox/Fingerprint/Reclaim reference lock

Companion: World Intelligence PR #25.