feat: Add comprehensive test planning capabilities

[tooniez]

Summary

Adds comprehensive test planning capabilities including a new test-planning skill, regression impact analysis command, and supporting rules for test data management, CI/CD quality gates, and test environment checklists.

Description

This PR introduces a complete test planning framework for AI agents working on software projects. The changes include:

New Skill: Test Planning

• Comprehensive skill for creating formal test plans with scope definition, resource allocation, risk assessment, entry/exit criteria, and test strategy documentation
• Includes templates and best practices for structured test planning
• Covers test deliverables, defect management, and test scheduling

New Command: Regression Impact Analyzer

• Specialized subagent that analyzes code changes to determine regression testing scope
• Identifies high-risk areas and provides prioritized test recommendations
• Maps code changes to affected test areas and suggests test suites to run or skip

New Rules:

• CI/CD Quality Gates: Defines mandatory quality gates for CI/CD pipelines including test coverage thresholds, defect severity rules, performance baselines, and security requirements
• Test Data Management: Standards for test data isolation, cleanup strategies, sensitive data handling, and environment-specific configurations
• Test Environment Checklist: Comprehensive checklists for test environment setup, validation, and maintenance including data refresh, service dependencies, and configuration verification

These additions provide AI agents with structured guidance for planning, executing, and managing testing activities throughout the software development lifecycle.

Changes

• Add skills/test-planning/SKILL.md - Comprehensive test planning skill with templates and best practices
• Add commands/regression-impact.md - Regression impact analysis subagent command
• Add rules/ci-cd-quality-gates.mdc - Quality gates for CI/CD pipelines
• Add rules/test-data-management.mdc - Test data management standards and practices
• Add rules/test-environment-checklist.mdc - Test environment setup and maintenance checklists
• Update README.md - Document new skill, rules, and command
• Update commands/README.md - Add regression-impact command reference
• Update rules/README.md - Add new quality and testing rules

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