docs: [#220] add implementation plan for test command architecture improvements

Author: josecelano

docs/implementation-plans/README.md

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+# Implementation Plans
+
+This directory contains detailed implementation plans for complex changes that require multiple steps to complete.
+
+## Purpose
+
+When working on issues that involve:
+
+- Significant architectural refactoring
+- Multiple phases with dependencies
+- Changes spanning many files across different layers
+- Complex coordination between features
+
+...we create detailed implementation plans here to:
+
+- Track progress systematically
+- Enable incremental commits with validation
+- Document decision rationale for each step
+- Provide clear recovery points if issues arise
+
+## Difference from Other Documentation
+
+- **`docs/roadmap/`**: High-level planned features and long-term vision
+- **`docs/refactors/`**: Planned large-scale refactoring initiatives
+- **`docs/implementation-plans/`**: Step-by-step execution plans for specific issues
+
+## Structure
+
+Each implementation plan document should include:
+
+1. **Context**: Brief description of the issue and why the plan is needed
+2. **Problem Analysis**: Architectural or technical issues being addressed
+3. **Progress Tracking**: Checklist of all steps with completion status
+4. **Phase Breakdown**: Logical grouping of related steps
+5. **Detailed Steps**: For each step:
+   - Clear commit message format
+   - Specific actions to take
+   - Files to create/modify/delete
+   - Pre-commit protocol (tests + linters)
+   - Time estimates
+
+## Naming Convention
+
+Files should be named: `issue-{number}-{short-description}.md`
+
+Examples:
+
+- `issue-220-test-command-architecture.md`
+- `issue-315-database-migration-strategy.md`
+
+## Workflow
+
+1. Create the plan when issue complexity becomes apparent
+2. Review and refine the plan before implementation
+3. Follow the plan step-by-step with incremental commits
+4. Update progress tracking as steps complete
+5. Keep the plan updated if changes are needed during implementation
+6. Archive completed plans in this directory for future reference