Remove conflicting tree dependency from openpi-client

[kstonekuan]

Summary

This removes the conflicting tree>=0.2.4 dependency from packages/openpi-client.

Why

openpi-client imports tree for tree.map_structure, but that import is provided by dm-tree, which is already declared as a dependency.

The separate PyPI package named tree can conflict with dm-tree because both use the tree import name. This was causing openpi-client imports to resolve to the wrong package depending on install order/environment.

Changes

• remove tree>=0.2.4 from packages/openpi-client/pyproject.toml
• update uv.lock (removes the transitive svgwrite lock entry)

Validation

• ran uv lock --check
• ran uv run --project packages/openpi-client --with pytest pytest packages/openpi-client
• ran uv run --no-sync ruff check --fix packages/openpi-client
• ran uv run --no-sync ruff format packages/openpi-client

Notes

This keeps dm-tree unchanged because it is the package that provides the tree.map_structure API used by openpi-client.

[jimmyt857]

Merge activity

• May 5, 4:07 PM UTC: A user started a stack merge that includes this pull request via Graphite.
• May 5, 4:07 PM UTC: Graphite couldn't merge this PR because it failed for an unknown reason (Fast-forward merges are not supported for forked repositories. Please create a branch in the target repository in order to merge).