Resolve installation and conversion errors

Symptom	Check and action
No matching *-bin or native wheel	Bundles target macOS arm64 and Python 3.12+. Use core or [engines] on other platforms.
Engine listed as unavailable	Check its CLI override, bundled package and PATH; run the CLI's --version.
EngineUnavailable	Install the needed optional dependency or runtime.
UnsupportedRoute	Check the format pair and policy in the route matrix. Raster output requires fidelity.
EngineFailed	Read its command and stderr tail; verify the product version and input support.
PackageError	Check manifest paths, package contents and destination directory.
UnsupportedSchema	The manifest schema is newer or unknown; use a compatible mcruft release.
Hash warning on load	An asset changed. Review it, call doc.refresh() and save to update hashes.
PDF fidelity export unavailable	The outline pass needs VectorCraft even when basic PDF page assembly works.

Print available backends:

import mcruft

for engine in mcruft.engines():
    print(engine.name, engine.kind, engine.available, engine.version)

When reporting an issue, include Python/platform, package and CLI versions, operation, policy, traceback and a shareable input that reproduces it. Remove private paths/content. Report an issue.