/branch

Create feature branch with Jira issue key naming and auto-transition

# Jira Branch Creation Command

Create a feature branch with Jira issue key naming convention, auto-generate description from issue summary, and optionally transition the issue to "In Progress".

## Step 0: Time Tracking Initialization

**AUTOMATIC**: This step runs silently before command execution begins.

The orchestration system tracks execution time for this command. When the command completes:
- If duration >= 60 seconds AND a Jira issue key is detected
- A worklog is automatically posted with comment: `[Claude] /jira:branch - {duration}`

### Issue Key Detection Priority
1. Command a...