fix(deploy): retire orphaned RoomDO namespace in hosted Wrangler exports

[sota009]

Problem

Deploying current main to the existing hosted agent-call.app Worker fails during Durable Object exports reconciliation:

[orphaned_provisioned_namespace] class 'RoomDO' has a provisioned Durable Object namespace but is neither in code nor in exports

PR #430 removed the Room code, binding, and live export, but the hosted account still has the previously provisioned RoomDO namespace. The repository's dry-run bundle and pnpm verify both pass because they cannot compare against live account state.

Fix

Keep a hosted-config deletion tombstone in apps/relay/wrangler.jsonc:

"RoomDO": { "type": "durable-object", "state": "deleted" }

The self-host example should remain unchanged because a new self-hosted account never provisioned RoomDO.

Acceptance

• pnpm verify passes.
• Hosted wrangler deploy --dry-run passes.
• Real hosted deployment reconciles and retires the orphaned namespace.
• agent-call.app/.well-known/agent-card.json remains healthy after deployment.

[sota009]

Fix implemented and deployed for internal demo validation.

• PR: fix(deploy): retire the removed RoomDO namespace #455
• Hosted deployment version: a7477a40-376e-4716-b94a-6ed074fc4bc1
• Cloudflare reconciliation: Deleted: RoomDO
• pnpm verify: passed
• Live directory card and landing page: HTTP 200
• Hosted end-to-end self-call: passed (pong)