Add celld as a community World

[ewhauser]

Description

Adds the published @ewhauser/world-celld package to worlds-manifest.json as an experimental, self-hosted community World.

The manifest marks celld as requiring deployment and credentials because applications connect to a separately deployed celld fleet using a shared secret. The web server allowlist now exposes the non-secret fleet and callback metadata while redacting CELLD_WORLD_SECRET.

How did you test your changes?

• Parsed and asserted the celld manifest entry and all required environment keys.
• Ran scripts/create-community-worlds-matrix.mjs and verified celld is excluded from local CI because it requires an external deployment and credentials.
• Ran Biome against every changed JSON and TypeScript file.
• Built the @workflow/web workspace dependencies and ran app/server/workflow-server-actions.server.test.ts (4 tests passed), including a new secret-redaction regression test.
• Ran pnpm exec changeset status --since=main.

PR Checklist - Required to merge

• 📦 pnpm changeset was run to create a changelog for this PR
• 🔒 DCO sign-off passes (git commit --signoff)
• 📝 Ping @vercel/workflow in a comment once the PR is ready, and the above checklist is complete

[changeset-bot]

🦋 Changeset detected

Latest commit: 138b104

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 16 packages

Name	Type
@workflow/web	Patch
@workflow/cli	Patch
@workflow/nitro	Patch
workflow	Patch
@workflow/world-testing	Patch
@workflow/nuxt	Patch
@workflow/core	Patch
@workflow/web-shared	Patch
@workflow/builders	Patch
@workflow/next	Patch
@workflow/vitest	Patch
@workflow/astro	Patch
@workflow/nest	Patch
@workflow/rollup	Patch
@workflow/sveltekit	Patch
@workflow/vite	Patch

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[vercel]

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[ewhauser]

@vercel/workflow new world backend for celld