Migrate onnx-genai metadata emitters to the current pipeline/speculative contract

pyproject.toml

@@ -60,6 +60,7 @@ where = ["src"]
 
 [tool.setuptools.package-data]
 "mobius.upstream_patches" = ["data/*/*/*.patch", "data/*/*/*.json", "data/*/*/*.md"]
+"mobius.integrations.onnx_genai" = ["_schema/*.json"]
 
 [tool.setuptools.dynamic]
 version = { attr = "mobius.__version__" }

src/mobius/integrations/onnx_genai/__init__.py

@@ -22,8 +22,9 @@
   :func:`write_audio_codec_workflow_metadata` emits typed codec SSA, while
   :func:`write_tts_workflow_metadata` reports the current nested-loop induction
   contract blocker precisely.
-* **Diffusion pipelines** — :func:`write_diffusion_pipeline_metadata` emits an
-  iterative pipeline for a denoiser plus optional VAE / text encoder.
+* **Diffusion pipelines** — :func:`write_diffusion_pipeline_metadata` emits a
+  typed SSA denoise loop for a denoiser plus VAE and optional text encoder,
+  shipping the sampler's solver/schedule components alongside it.
 
 :func:`write_onnx_genai_config` is the unified entry point: it inspects the
 built package and dispatches to the matching writer, so

src/mobius/integrations/onnx_genai/_schema/README.md

@@ -0,0 +1,30 @@
+# Vendored onnx-genai metadata schema
+
+`inference_metadata.schema.json` is a verbatim copy of onnx-genai's published
+`schema/inference_metadata.schema.json`, which that repo generates from its Rust
+types (`crates/onnx-genai-metadata/src/schema/`).
+
+**Why it is vendored.** The schema conformance tests used to look for a local
+onnx-genai checkout and `pytest.skip` when they could not find one. CI has no
+such checkout, so every one of those tests skipped there and the emitters were
+only ever validated on the few developer machines that happened to have
+onnx-genai cloned — and then only against whatever revision that clone sat on.
+Two upstream contract redesigns (`pipeline` becoming a `PipelineSpec` whose only
+property is `workflow`, and `speculative` becoming a `SpeculativeContract`) went
+unnoticed for exactly that reason. Pinning the schema here makes the contract
+mobius targets an explicit, reviewable file and makes drift a CI failure rather
+than a silent skip.
+
+**Updating it.** Copy the file from onnx-genai `main` and run the onnx-genai
+tests in this package:
+
+```bash
+cp <onnx-genai>/schema/inference_metadata.schema.json \
+   src/mobius/integrations/onnx_genai/_schema/
+python -m pytest src/mobius/integrations/onnx_genai/ -q
+```
+
+Set `ONNX_GENAI_SCHEMA=/path/to/inference_metadata.schema.json` to validate
+against a different revision without editing this copy.
+
+Synced from onnx-genai `10dfcd788` (2026-08-22).