new: add constella

[joein]

I reran experiments for NFCorpus and got the following results:
Qdrant/constella-nano - 0.363080 - Exact match
Qdrant/constella-zero- 0.312416 - Matches at the card's precision
Qdrant/stella-en-400M-v5-doc-onnx with the s2p_query prompt - 0.413415 - Matches at the card's precision

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Advanced

Run ID: 4aded34e-fe9c-4f59-b764-cfa2f2d5e674

📥 Commits

Reviewing files that changed from the base of the PR and between b50831a and cb25100.

📒 Files selected for processing (3)

• fastembed/text/onnx_embedding.py
• fastembed/text/pooled_normalized_embedding.py
• tests/test_text_onnx_embeddings.py

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📝 Walkthrough

Walkthrough

The supported ONNX model catalog adds Qdrant/constella-zero and Qdrant/stella-en-400M-v5-doc-onnx. The pooled normalized model catalog adds Qdrant/constella-nano. The ONNX embedding test fixture adds canonical vectors for all three models.

Priority: ⬇️ Low

Estimated code review effort: 2 (Simple) | ~8 minutes

Change: Feature

Merge Risk: ⚪ Minimal · up to cb251

The new model entries use their intended embedding paths and have canonical-vector checks when selected. No concrete load or output failure is established; external artifacts still need normal validation.

Security Architecture Review

Security architecture risk: 🔵 Low · up to cb251

The new embedding options use existing selection and download controls. They add a limited external-artifact trust dependency when selected, but no boundary bypass or security finding was established.

Retained concerns

• Low · security · inferred: The newly selectable models add three remote artifact sources without immutable revisions in their catalog descriptors. A deployment that selects them consequently extends its artifact trust to those upstream repositories; existing cache-integrity checks do not by themselves establish a fixed publisher version.

Security review details

Security Blast Radius

• inferred — The incremental exposure is limited to processes that select an added model and obtain its artifact; no deployed tenant, service, or environment scope is established by the available evidence.

Trust Boundaries and Controls

• inferred — An arbitrary caller-supplied model name does not become an arbitrary download source: registry matching precedes construction. The shared downloader checks cached-file metadata, but that control does not establish an immutable revision for a newly added repository.

Hardening Proposals

• proposed — Where deployments require reproducible, high-trust artifacts, pin or independently verify the revisions used for these new model sources.

🚥 Pre-merge checks | ✅ 4 | ❓ 1

❌ Failed checks (1 inconclusive)

Check name	Status	Explanation	Resolution
Description check	❓ Inconclusive	No pull request description was provided. The description check cannot confirm that the author documented the changeset.	Add a brief description that states which Constella and Stella models were added and that their expected embedding values were added to the tests.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 3…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly identifies the primary change: adding Constella models. It is concise and related to the changeset, although it does not mention the additional Stella model.

✨ Finishing Touches

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🧪 Generate unit tests (beta)

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