fix: avoid bool-checking query namespace vectors

[pragnyanramtha]

Summary

• avoid boolean-coercing dense vectors in sync and async query_namespaces() validation
• preserve existing empty-vector validation while allowing sequence-like vectors with ambiguous truth values
• add sync and async regression tests that assert vectors are passed through to query() unchanged

Validation

• uv run --no-sync pytest tests/unit/test_query_namespaces.py tests/unit/test_async_query_namespaces.py tests/unit/async_client/test_async_index_query_namespaces.py -q (34 passed)
• uv run --no-sync ruff check pinecone/index/__init__.py pinecone/async_client/async_index.py tests/unit/test_query_namespaces.py tests/unit/test_async_query_namespaces.py
• uv run --no-sync ruff format --check pinecone/index/__init__.py pinecone/async_client/async_index.py tests/unit/test_query_namespaces.py tests/unit/test_async_query_namespaces.py
• uv run --no-sync mypy --strict pinecone/index/__init__.py pinecone/async_client/async_index.py
• git diff --check

Note: a full editable project build was not run locally because this machine does not have protoc; CI installs protoc before building the Rust extension.

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Note

Low Risk
Low risk: small validation tweak in query_namespaces() to treat only None/empty dense vectors as missing while avoiding __bool__ evaluation; covered by new sync/async regression tests.

Overview
Fixes Index.query_namespaces() and AsyncIndex.query_namespaces() validation to stop boolean-coercing the provided dense vector, checking explicitly for None or len(vector)==0 instead.

Adds sync and async unit tests using a sequence-like vector with an ambiguous truth value to ensure the vector is accepted and forwarded through to query() unchanged, while preserving the existing empty-vector error behavior.

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