feat(agents): implement cs-product-manager agent and agent template
Day 4: Product Agent + Template - Complete implementation of product
management agent and comprehensive template for future agent development.
## cs-product-manager
- Product management agent for feature prioritization and customer discovery
- RICE framework implementation, customer interview analysis, PRD development
- 4 complete workflows: feature prioritization & roadmap, customer discovery,
PRD development, quarterly planning & OKRs
- Integration with rice_prioritizer.py and customer_interview_analyzer.py tools
- Success metrics: <2 days decision speed, 10-15 interviews per sprint,
>90% engineering clarity, >60% feature adoption
## agent-template.md
- Comprehensive template for creating new cs-* agents
- 318 lines with detailed instructions and examples
- All required sections documented with explanatory comments
- References 5 completed agents as examples
- Includes YAML frontmatter structure, workflow patterns, integration examples
## Quality Validation
✅ YAML frontmatter with all required fields
✅ cs-* prefix naming convention
✅ 4 workflows (exceeds minimum 3)
✅ Relative paths tested and validated
✅ Integration examples with bash scripts
✅ Success metrics defined with targets
✅ Template includes comprehensive instructions
Sprint: sprint-11-05-2025 (Day 4)
Issues: #13, #14
Files: 2 files, 725 total lines
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