Complete PRD Implementation

Complete the PRD implementation workflow including branch management, pull request creation, and issue closure.

Note: If any gh command fails with "command not found", inform the user that GitHub CLI is required and provide the installation link: https://cli.github.com/

Workflow Steps

0. Implementation Type Detection

FIRST: Determine the type of PRD completion to choose the appropriate workflow

Documentation-Only Completion (Skip PR workflow):

• ✅ Changes are only to PRD files or project management documents
• ✅ No source code changes
• ✅ No configuration changes
• ✅ Feature was already implemented in previous work
• → Use Simplified Workflow (Steps 1, 2-simplified, 5 only)