Add Doppel model card

README.md

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+---
+license: apache-2.0
+library_name: coreml
+pipeline_tag: feature-extraction
+base_model: jinaai/jina-embeddings-v2-small-en
+inference: false
+tags:
+  - coreml
+  - apple-silicon
+  - macos
+  - on-device
+  - text-embeddings
+  - doppel
+---
+
+# Doppel embeddings companion
+
+This repository is Doppel's distribution channel for an app-specific Core ML
+conversion of
+[`jinaai/jina-embeddings-v2-small-en`](https://huggingface.co/jinaai/jina-embeddings-v2-small-en).
+It supports Doppel's private, on-device search index.
+
+## Intended use
+
+These artifacts are intended to be downloaded, verified, and invoked by
+Doppel on Apple-silicon Macs running macOS 15 or later. Indexed content and
+generated embeddings remain on the user's device.
+
+This is not a standalone embedding distribution or a supported developer API.
+The repository does not include Doppel's text preparation, pooling,
+normalization, indexing, retrieval, or compatibility logic. Results produced
+outside that contract are not supported or comparable to Doppel search. For
+general-purpose use, start with the upstream model.
+
+## Artifact and integrity notes
+
+The compiled Core ML components are modified from the upstream checkpoint for
+Doppel's bounded runtime shapes. `jina_coreml_manifest.json` is the
+authoritative artifact inventory and records the integrity hashes checked by
+the app.
+
+The repository contains no user documents, embeddings, search indexes,
+queries, prompts, telemetry, or other customer data.
+
+## Limitations
+
+Embedding similarity is not a factuality, authorization, or safety signal.
+Retrieval quality varies with language, document structure, terminology, and
+the surrounding search pipeline.
+
+## License and attribution
+
+The upstream model is provided under the
+[Apache License 2.0](https://www.apache.org/licenses/LICENSE-2.0).
+This converted distribution remains subject to the applicable upstream terms.
+Doppel provides no support or warranty for use outside the Doppel app.