fix(patches): return empty object for unhandled manifests in loadManifest

[nathanschram]

Summary

• Return {} instead of throwing for manifest paths not found during the build-time glob scan in loadManifest() and evalManifest()
• Handles Next.js 16.2.0-canary.53+ which introduces new loadManifest() calls for optional/phase-dependent manifests

Problem

Next.js canary adds loadManifest() calls for:

1. subresource-integrity-manifest.json - only generated when experimental.sri is configured, but loaded unconditionally
2. Per-route react-loadable-manifest.json - generated by Turbopack, possibly in a different build phase

The adapter's build-time glob scan doesn't find these files, so the patched function throws at runtime, crashing all dynamic routes with 500.

Fix

Replace the throw new Error('Unexpected loadManifest...') fallback with return {}. This follows the same defensive pattern used by other adapter plugins (instrumentation.ts, find-dir.ts) that return safe defaults for missing files.

Test plan

• Build a Next.js app with next@canary (16.2.0-canary.53+) using @opennextjs/cloudflare
• Verify dynamic/SSR routes no longer return 500
• Verify existing manifests still load correctly (app-manifest, build-manifest, etc.)
• Verify SRI works correctly when experimental.sri IS configured

Fixes #1141

[changeset-bot]

🦋 Changeset detected

Latest commit: 5c0f1be

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

This PR includes changesets to release 1 package

Name	Type
@opennextjs/cloudflare	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[nathanschram]

Hey @vicb - just wanted to check in on this. No rush at all, I know you're probably busy. Just wanted to make sure the approach looks reasonable to you, or if you'd prefer I take it in a different direction. Happy to adjust anything.

[Rovak]

Can confirm that is working for me in production after copying this patch into the project using pnpm patch

[bonadio]

Need this fix too.
Thanks