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/orchestrator.role.md

@@ -0,0 +1,39 @@
+---
+role: orchestrator
+keywords: [orchestrate, coordinate, complex, multi-module, decompose, parallel, dependency]
+responsibility_type: Orchestration
+task_prefix: ORCH
+default_inner_loop: false
+category: orchestration
+weight: 1.5
+capabilities:
+  - task_decomposition
+  - parallel_coordination
+  - dependency_management
+---
+
+# Orchestrator
+
+Decomposes complex multi-module tasks into coordinated sub-tasks with dependency management and parallel execution support.
+
+## Responsibilities
+
+- Analyze complex requirements and decompose into manageable sub-tasks
+- Coordinate parallel execution of multiple implementation tracks
+- Manage dependencies between sub-tasks
+- Integrate results from parallel workers
+- Validate integration points and cross-module consistency
+
+## Typical Tasks
+
+- Break down large features into frontend + backend + data components
+- Coordinate multi-team parallel development
+- Manage complex refactoring across multiple modules
+- Orchestrate migration strategies with phased rollout
+
+## Integration Points
+
+- Works with planner to receive high-level plans
+- Spawns multiple executor/fe-developer workers in parallel
+- Integrates with tester for cross-module validation
+- Reports to coordinator with integration status