[general-purpose] Test stacked PR with fix

[sylvansys]

Parent Issue: #321
Agent Type: general-purpose
Branch: 321-feature/can-u-integrate-changes-from-httpsgithub

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Task Description

Test stacked PR with fix

Task Prompt

Create a test file to verify the stacked PR workflow with the fix:

Create file plugins/github-orchestration/test-stacked-pr-v2.md:

# Stacked PR Test v2

Created at: [fill in timestamp]
Purpose: Test that SubagentStop hook creates PR after fix

Expected outcome:
- Branch created on SubagentStart
- File committed on SubagentStop  
- PR created and linked

Fill in the actual timestamp. This tests the fixed gh pr create command.