Implement complete Team Composer service for WHOOSH MVP

Add sophisticated team formation engine with:
- Task analysis and classification algorithms
- Skill requirement detection and mapping
- Agent capability matching with confidence scoring
- Database persistence with PostgreSQL/pgx integration
- Production-ready REST API endpoints

API endpoints added:
- POST /api/v1/teams (create teams with analysis)
- GET /api/v1/teams (list teams with pagination)
- GET /api/v1/teams/{id} (get team details)
- POST /api/v1/teams/analyze (analyze without creating)
- POST /api/v1/agents/register (register new agents)

Core Team Composer capabilities:
- Heuristic task classification (9 task types)
- Multi-dimensional complexity assessment
- Technology domain identification
- Role-based team composition strategies
- Agent matching with skill/availability scoring
- Full database CRUD with transaction support

This moves WHOOSH from basic N8N workflow stubs to a fully
functional team composition system with real business logic.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

go.mod

@@ -10,14 +10,15 @@ require (
 	github.com/go-chi/cors v1.2.1
 	github.com/go-chi/render v1.0.3
 	github.com/golang-migrate/migrate/v4 v4.17.0
+	github.com/google/uuid v1.6.0
 	github.com/jackc/pgx/v5 v5.5.2
+	github.com/jmoiron/sqlx v1.4.0
 	github.com/kelseyhightower/envconfig v1.4.0
 	github.com/rs/zerolog v1.32.0
 )
 
 require (
 	github.com/ajg/form v1.5.1 // indirect
-	github.com/google/uuid v1.6.0 // indirect
 	github.com/hashicorp/errwrap v1.1.0 // indirect
 	github.com/hashicorp/go-multierror v1.1.1 // indirect
 	github.com/jackc/pgpassfile v1.0.0 // indirect