feat(rules): add development-workflow.md with Feature Implementation Workflow (refs #235)

This document outlines the full feature development process, including planning, TDD, code review, and committing to git.

rules/common/development-workflow.md

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+# Development Workflow
+
+> This file extends [common/git-workflow.md](./git-workflow.md) with the full feature development process that happens before git operations.
+
+The Feature Implementation Workflow describes the development pipeline: planning, TDD, code review, and then committing to git.
+
+## Feature Implementation Workflow
+
+1. **Plan First**
+   - Use **planner** agent to create implementation plan
+   - Identify dependencies and risks
+   - Break down into phases
+
+2. **TDD Approach**
+   - Use **tdd-guide** agent
+   - Write tests first (RED)
+   - Implement to pass tests (GREEN)
+   - Refactor (IMPROVE)
+   - Verify 80%+ coverage
+
+3. **Code Review**
+   - Use **code-reviewer** agent immediately after writing code
+   - Address CRITICAL and HIGH issues
+   - Fix MEDIUM issues when possible
+
+4. **Commit & Push**
+   - Detailed commit messages
+   - Follow conventional commits format
+   - See [git-workflow.md](./git-workflow.md) for commit message format and PR process