Improve planning agent with diverse team and living plan

[bmbouter]

Summary

• Replace planning agent prompt with a multi-perspective SDLC planning committee (System Architect, UI/UX Designer, Security Red Team, DevOps Engineer, Technical Writer, QA/Testing Specialist, Performance Engineer) that produces structured implementation plans with work breakdowns, risk analysis, and open questions
• Add milestone-planner.yml workflow that triggers on issues and issue_comment events (labeled/created actions) for issues with the needs-planning label, using polling delivery mode
• Update alcove-planner security profile to include update_issue operation, allowing the planner to edit issue bodies to maintain a living implementation plan
• Loop prevention built into the prompt: exits immediately if the most recent comment is from alcove-bot

Test plan

• Verify the planning agent definition parses correctly (agent sync)
• Verify the workflow definition parses correctly (workflow sync)
• Verify the security profile includes update_issue in allowed operations
• Test end-to-end by labeling an issue with needs-planning and confirming the agent produces a structured plan

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