fix(python): normalize doc numpy vectors

[HosniBelfeki]

Summary

This makes direct Doc(...) construction follow the documented vector normalization behavior.

Previously, Doc._from_tuple() converted numpy vector values to plain Python lists, but Doc.init kept numpy.ndarray values unchanged. That could make repr(doc) fail JSON serialization and return the fallback error string for documents constructed directly with numpy vectors.

This routes both initialization paths through the same vector normalization helper and adds a regression test covering direct Doc(...) construction with a numpy vector.

Tests

• python -m ruff check python/zvec/model/doc.py python/tests/test_doc.py
• python -m ruff format --check python/zvec/model/doc.py python/tests/test_doc.py
• python -m py_compile python/zvec/model/doc.py python/tests/test_doc.py

Note: focused pytest against the local source tree is blocked in this workspace because zvec._zvec is not built locally.

[Copilot]

Pull request overview

This PR aligns Python Doc construction with the documented vector normalization behavior by ensuring numpy vectors are consistently converted into JSON-serializable Python types regardless of which construction path is used.

Changes:

• Route Doc.__init__ vector handling through a shared _normalize_vectors() helper to convert numpy.ndarray values via tolist().
• Reuse the same normalization helper in Doc._from_tuple() to avoid divergent behavior between initialization paths.
• Add a regression test to ensure repr(doc) remains JSON-serializable when Doc(...) is constructed directly with numpy vectors.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
python/zvec/model/doc.py	Centralizes numpy vector normalization for both __init__ and _from_tuple() to keep Doc.vectors JSON-safe.
python/tests/test_doc.py	Adds a regression test asserting direct Doc(...) construction with numpy vectors normalizes correctly and keeps repr() JSON-decodable.

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[HosniBelfeki]

Updated this branch with the latest upstream main after the linux-x64 run hit an unrelated native HNSW/RaBitQ test failure. The PR still only changes the Python Doc normalization path and its focused regression test. Local focused checks continue to pass: ruff check, ruff format --check, and py_compile for the changed files.

[Copilot]

Pull request overview

Copilot reviewed 2 out of 2 changed files in this pull request and generated no new comments.