Fix #632: "import weave" has an issue

[JiwaniZakir]

Closes #632

Before

import weave raised an ImportError at startup:

ImportError: cannot import name 'TransportConnectionFailed' from 'gql.transport.exceptions'

weave==0.52.35 depends on TransportConnectionFailed from the gql package, but gql<4 (e.g. gql==3.4.1) does not export that name. The constraint in pyproject.toml under the backend optional dependencies allowed any gql version below 4, which resolved to an incompatible release.

After

gql>=4.0.0 is installed, which exports TransportConnectionFailed from gql.transport.exceptions as weave expects. import weave succeeds without error.

Changes

• pyproject.toml, backend dependencies (line 40): changed "gql<4" to "gql>=4.0.0".

Testing

Install the backend extras and verify the import resolves cleanly:

pip install -e ".[backend]"
python -c "import weave; print('ok')"

Expected output: ok with no ImportError. Previously this command produced the TransportConnectionFailed import failure.

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This PR was created with AI assistance (Claude). The changes were reviewed by quality gates and a critic model before submission.