chore: add LICENSE and transfer PyPI ownership

[cusell-google]

This PR adds a LICENSE and handles the transition of the PyPI package ownership as a temporary approach until we find a generic group or alias.

[gemini-code-assist]

Summary of Changes

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This pull request focuses on establishing proper licensing and updating package metadata for the UCP Python SDK. It ensures that the project explicitly states its Apache 2.0 license and prepares the package for better distribution and identification on PyPI by enriching its configuration with relevant classifiers and updating the primary author for ownership transfer purposes.

Highlights

• License Addition: A LICENSE file has been added to the repository, specifying the Apache License, Version 2.0, and updating the copyright information to '2026 UCP Authors'.
• PyPI Package Metadata Update: The pyproject.toml file has been updated to reference the newly added LICENSE file and include a comprehensive set of classifiers for better package discoverability on PyPI.
• Ownership Transfer: The author in pyproject.toml has been updated from 'Florin Iucha' to 'Enric Cusell', facilitating the temporary transfer of PyPI package ownership as described in the PR description.

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[gemini-code-assist]

Code Review

This pull request adds a license file and updates the pyproject.toml with new metadata, including classifiers and a change of authorship. While the updates to pyproject.toml are beneficial, there is a significant issue in the LICENSE file. The copyright year has been set to 2026, a future date, which is legally incorrect and should be updated to the current year.

[ptiper]

Nit: could we get at least 1 more person for coverage?

[cusell-google]

keeping Florin and adding myself. I'll update it further with another contributor.

[cusell-google]

Merged which had conflicts, updated with 2 authors: Federico D'Amato and Enric Cusell.