feat(agents): add category and display fields to AgentType model

Add 6 new fields to AgentType for better organization and UI display:
- category: enum for grouping (development, design, quality, etc.)
- icon: Lucide icon identifier for UI
- color: hex color code for visual distinction
- sort_order: display ordering within categories
- typical_tasks: list of tasks the agent excels at
- collaboration_hints: agent slugs that work well together

Backend changes:
- Add AgentTypeCategory enum to enums.py
- Update AgentType model with 6 new columns and indexes
- Update schemas with validators for new fields
- Add category filter and /grouped endpoint to routes
- Update CRUD with get_grouped_by_category method
- Update seed data with categories for all 27 agents
- Add migration 0007

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

backend/app/models/syndarix/agent_type.py

@@ -6,7 +6,7 @@ An AgentType is a template that defines the capabilities, personality,
 and model configuration for agent instances.
 """
 
-from sqlalchemy import Boolean, Column, Index, String, Text
+from sqlalchemy import Boolean, Column, Index, Integer, String, Text
 from sqlalchemy.dialects.postgresql import JSONB
 from sqlalchemy.orm import relationship
 
@@ -56,6 +56,24 @@ class AgentType(Base, UUIDMixin, TimestampMixin):
     # Whether this agent type is available for new instances
     is_active = Column(Boolean, default=True, nullable=False, index=True)
 
+    # Category for grouping agents (development, design, quality, etc.)
+    category = Column(String(50), nullable=True, index=True)
+
+    # Lucide icon identifier for UI display (e.g., "code", "palette", "shield")
+    icon = Column(String(50), nullable=True, default="bot")
+
+    # Hex color code for visual distinction (e.g., "#3B82F6")
+    color = Column(String(7), nullable=True, default="#3B82F6")
+
+    # Display ordering within category (lower = first)
+    sort_order = Column(Integer, nullable=False, default=0, index=True)
+
+    # List of typical tasks this agent excels at
+    typical_tasks = Column(JSONB, default=list, nullable=False)
+
+    # List of agent slugs that collaborate well with this type
+    collaboration_hints = Column(JSONB, default=list, nullable=False)
+
     # Relationships
     instances = relationship(
         "AgentInstance",
@@ -66,6 +84,7 @@ class AgentType(Base, UUIDMixin, TimestampMixin):
     __table_args__ = (
         Index("ix_agent_types_slug_active", "slug", "is_active"),
         Index("ix_agent_types_name_active", "name", "is_active"),
+        Index("ix_agent_types_category_sort", "category", "sort_order"),
     )
 
     def __repr__(self) -> str:

backend/app/models/syndarix/enums.py

@@ -167,3 +167,29 @@ class SprintStatus(str, PyEnum):
     IN_REVIEW = "in_review"
     COMPLETED = "completed"
     CANCELLED = "cancelled"
+
+
+class AgentTypeCategory(str, PyEnum):
+    """
+    Category classification for agent types.
+
+    Used for grouping and filtering agents in the UI.
+
+    DEVELOPMENT: Product, project, and engineering roles
+    DESIGN: UI/UX and design research roles
+    QUALITY: QA and security engineering
+    OPERATIONS: DevOps and MLOps
+    AI_ML: Machine learning and AI specialists
+    DATA: Data science and engineering
+    LEADERSHIP: Technical leadership roles
+    DOMAIN_EXPERT: Industry and domain specialists
+    """
+
+    DEVELOPMENT = "development"
+    DESIGN = "design"
+    QUALITY = "quality"
+    OPERATIONS = "operations"
+    AI_ML = "ai_ml"
+    DATA = "data"
+    LEADERSHIP = "leadership"
+    DOMAIN_EXPERT = "domain_expert"