test: tests fail for developers with global git hooks

[assagman]

Description

Tests fail for developers who have global git hooks configured (e.g., sign-off requirements via commit-msg or prepare-commit-msg hooks).

When a developer has hooks configured globally in ~/.config/git/hooks/ or via core.hooksPath, these hooks are picked up by the test fixture git repositories, causing unexpected test failures.

Steps to reproduce

1. Configure a global git hook (e.g., sign-off requirement)
2. Run bun test in packages/opencode
3. Observe test failures related to git operations

Expected behavior

Tests should run in an isolated environment and not be affected by developer's local git configuration.

Fix

Resolved in #8898 - Test fixtures now use isolated git config and an empty hooks directory.

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OpenCode version: 0.0.0-dev-202601161353
OS: macOS Tahoe 26.3 arm64
Terminal: ghostty 1.2.3, tmux next-3.5

[github-actions]

This issue might be a duplicate of existing issues. Please check:

• opencode modifies git index when executed in prepare-commit-msg hook #6553: opencode modifies git index when executed in prepare-commit-msg hook

Feel free to ignore if none of these address your specific case.