help: spec_too_large

What it means: The spec argument serializes to more bytes than this host allows for one tool.

Likely cause: An oversized source file, an embedded data blob, or a schema that grew past the 64 KiB spec cap.

Fix: Shrink the spec -- move large constant data into host.state or host.docs.put and read it at call time instead of inlining it in the spec.