chore: install openagent opencode

Signed-off-by: Dmytro Stanchiev <git@dmytros.dev>

.opencode/context/core/workflows/review.md

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+<!-- Context: workflows/review | Priority: high | Version: 2.0 | Updated: 2025-01-21 -->
+
+# Code Review Guidelines
+
+> **Note**: This is a reference file. The full content is in [`code-review.md`](./code-review.md).
+
+## Quick Reference
+
+**Golden Rule**: Review code as you'd want yours reviewed - thoroughly but kindly
+
+**Checklist**: Functionality, Code Quality, Security, Testing, Performance, Maintainability
+
+**Report Format**: Summary, Assessment, Issues (🔴🟡🔵), Positive Observations, Recommendations
+
+**Principles**: Constructive, Thorough, Timely
+
+---
+
+For the complete code review guidelines, see [code-review.md](./code-review.md).