Fix odoc doc build warnings: Tsig_include annotation, onnxrt refs, fatal warnings
- Fix typedtree_traverse Tsig_include to record ModuleType instead of Module,
resolving Stdlib.Hashtbl.HashedType resolution failure in compile-impl
- Qualify unresolved doc references in onnxrt.mli (e.g. {!run} -> {!Session.run})
- Fix {!type-Tensor.location} disambiguation syntax to {!Tensor.type-location}
- Fix {v ... v} code block indentation in onnxrt.mli
- Enable fatal doc warnings in dune-workspace
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>