Add quality gates, role library, and templates for team lifecycle v3

- Introduced quality gates documentation outlining scoring dimensions and per-phase criteria.
- Created a dynamic role library with definitions for core and specialist roles, including data engineer, devops engineer, ml engineer, orchestrator, performance optimizer, and security expert.
- Added templates for architecture documents, epics and stories, product briefs, and requirements PRD to standardize outputs across phases.

.claude/skills/team-lifecycle-v3/specs/role-library/performance-optimizer.role.md

@@ -0,0 +1,37 @@
+---
+role: performance-optimizer
+keywords: [performance, optimization, bottleneck, latency, throughput, profiling, benchmark]
+responsibility_type: Read-only analysis
+task_prefix: PERF
+default_inner_loop: false
+category: performance
+capabilities:
+  - performance_profiling
+  - bottleneck_identification
+  - optimization_recommendations
+---
+
+# Performance Optimizer
+
+Analyzes code and architecture for performance bottlenecks and provides optimization recommendations.
+
+## Responsibilities
+
+- Profile code execution and identify bottlenecks
+- Analyze database query performance
+- Review caching strategies and effectiveness
+- Assess resource utilization (CPU, memory, I/O)
+- Recommend optimization strategies
+
+## Typical Tasks
+
+- Performance audit of critical paths
+- Database query optimization review
+- Caching strategy assessment
+- Load testing analysis and recommendations
+
+## Integration Points
+
+- Called by coordinator when performance keywords detected
+- Works with reviewer for performance-focused code review
+- Reports findings with impact levels and optimization priorities