fix(opencode_env): remove non-existent tests package from setuptools config

[sergiopaniego]

Summary

Removes opencode_env.tests from the [tool.setuptools] packages list in
envs/opencode_env/pyproject.toml. The directory envs/opencode_env/tests/
was declared but never created, causing uv sync --no-editable to fail during
Docker builds with:

error: package directory 'tests' does not exist

Introduced in PR #656. Not caught earlier because pip install -e . (editable
mode) doesn't validate package directories at install time — only --no-editable
does, which is what the Dockerfile uses.

It generates an error in GH Action (see https://github.com/huggingface/OpenEnv/actions/runs/26807926904/job/79030213083)

@adithya-s-k @burtenshaw

Type of Change

• Bug fix
• New feature
• Breaking change
• Documentation
• New environment
• Refactoring

Alignment Checklist

Before submitting, verify:

• I have read .claude/docs/PRINCIPLES.md and this PR aligns with our principles
• I have checked .claude/docs/INVARIANTS.md and no invariants are violated
• I have run /pre-submit-pr (or bash .claude/hooks/lint.sh and tests) and addressed all issues

RFC Status

• Not required (bug fix, docs, minor refactoring)
• RFC exists: #___
• RFC needed (will create before merge)

Test Plan

The Docker build for envs/opencode_env should complete without error. Verify
by running the build-envs CI workflow or locally:

docker build -f envs/opencode_env/server/Dockerfile envs/opencode_env

Claude Code Review

N/A

[Darktex]

Note: This is an automated review by Claude Code, not a human review.

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Alignment Review Report

Automated Checks

• Lint: PASS (only pyproject.toml changed)
• Debug code: CLEAN

Tier 1: Fixes Required

None. The fix is correct — envs/opencode_env/tests/ does not exist, and removing the opencode_env.tests package reference from both packages and package-dir eliminates the uv sync --no-editable failure.

Tier 2: Alignment Discussion

None. Narrow build config fix with no impact on APIs, invariants, or principles.

Summary

• 0 mechanical issues
• 0 alignment points
• Safe to merge.

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Automated review by Claude Code

[bot-ci-comment]

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