feat(agent-teams): add plugin for multi-agent team orchestration

New plugin with 7 presets (review, debug, feature, fullstack, research,
security, migration), 4 specialized agents, 7 slash commands, 6 skills
with reference docs, and Context7 MCP integration for research teams.

plugins/agent-teams/skills/parallel-feature-development/SKILL.md

@@ -0,0 +1,151 @@
+---
+name: parallel-feature-development
+description: Coordinate parallel feature development with file ownership strategies, conflict avoidance rules, and integration patterns for multi-agent implementation. Use this skill when decomposing features for parallel development, establishing file ownership boundaries, or managing integration between parallel work streams.
+---
+
+# Parallel Feature Development
+
+Strategies for decomposing features into parallel work streams, establishing file ownership boundaries, avoiding conflicts, and integrating results from multiple implementer agents.
+
+## When to Use This Skill
+
+- Decomposing a feature for parallel implementation
+- Establishing file ownership boundaries between agents
+- Designing interface contracts between parallel work streams
+- Choosing integration strategies (vertical slice vs horizontal layer)
+- Managing branch and merge workflows for parallel development
+
+## File Ownership Strategies
+
+### By Directory
+
+Assign each implementer ownership of specific directories:
+
+```
+implementer-1: src/components/auth/
+implementer-2: src/api/auth/
+implementer-3: tests/auth/
+```
+
+**Best for**: Well-organized codebases with clear directory boundaries.
+
+### By Module
+
+Assign ownership of logical modules (which may span directories):
+
+```
+implementer-1: Authentication module (login, register, logout)
+implementer-2: Authorization module (roles, permissions, guards)
+```
+
+**Best for**: Feature-oriented architectures, domain-driven design.
+
+### By Layer
+
+Assign ownership of architectural layers:
+
+```
+implementer-1: UI layer (components, styles, layouts)
+implementer-2: Business logic layer (services, validators)
+implementer-3: Data layer (models, repositories, migrations)
+```
+
+**Best for**: Traditional MVC/layered architectures.
+
+## Conflict Avoidance Rules
+
+### The Cardinal Rule
+
+**One owner per file.** No file should be assigned to multiple implementers.
+
+### When Files Must Be Shared
+
+If a file genuinely needs changes from multiple implementers:
+
+1. **Designate a single owner** — One implementer owns the file
+2. **Other implementers request changes** — Message the owner with specific change requests
+3. **Owner applies changes sequentially** — Prevents merge conflicts
+4. **Alternative: Extract interfaces** — Create a separate interface file that the non-owner can import without modifying
+
+### Interface Contracts
+
+When implementers need to coordinate at boundaries:
+
+```typescript
+// src/types/auth-contract.ts (owned by team-lead, read-only for implementers)
+export interface AuthResponse {
+  token: string;
+  user: UserProfile;
+  expiresAt: number;
+}
+
+export interface AuthService {
+  login(email: string, password: string): Promise<AuthResponse>;
+  register(data: RegisterData): Promise<AuthResponse>;
+}
+```
+
+Both implementers import from the contract file but neither modifies it.
+
+## Integration Patterns
+
+### Vertical Slice
+
+Each implementer builds a complete feature slice (UI + API + tests):
+
+```
+implementer-1: Login feature (login form + login API + login tests)
+implementer-2: Register feature (register form + register API + register tests)
+```
+
+**Pros**: Each slice is independently testable, minimal integration needed.
+**Cons**: May duplicate shared utilities, harder with tightly coupled features.
+
+### Horizontal Layer
+
+Each implementer builds one layer across all features:
+
+```
+implementer-1: All UI components (login form, register form, profile page)
+implementer-2: All API endpoints (login, register, profile)
+implementer-3: All tests (unit, integration, e2e)
+```
+
+**Pros**: Consistent patterns within each layer, natural specialization.
+**Cons**: More integration points, layer 3 depends on layers 1 and 2.
+
+### Hybrid
+
+Mix vertical and horizontal based on coupling:
+
+```
+implementer-1: Login feature (vertical slice — UI + API + tests)
+implementer-2: Shared auth infrastructure (horizontal — middleware, JWT utils, types)
+```
+
+**Best for**: Most real-world features with some shared infrastructure.
+
+## Branch Management
+
+### Single Branch Strategy
+
+All implementers work on the same feature branch:
+
+- Simple setup, no merge overhead
+- Requires strict file ownership to avoid conflicts
+- Best for: small teams (2-3), well-defined boundaries
+
+### Multi-Branch Strategy
+
+Each implementer works on a sub-branch:
+
+```
+feature/auth
+  ├── feature/auth-login      (implementer-1)
+  ├── feature/auth-register    (implementer-2)
+  └── feature/auth-tests       (implementer-3)
+```
+
+- More isolation, explicit merge points
+- Higher overhead, merge conflicts still possible in shared files
+- Best for: larger teams (4+), complex features