Refactor: Deduplicate agent creation logic with shared factory

[jkoelker]

Problem

Agent creation code has significant duplication across multiple files:

• Tool restrictions repeated in every agent
• Temperature default (0.1) repeated
• Agent factory pattern identical in each file
• Metadata exports duplicated

Proposed Solution

Create shared utilities in :

1. • Generic agent factory with shared logic
2. • Centralize default models and temperatures
3. • Unified metadata interface

Benefits

• Single source of truth for agent configuration
• Easier to test and maintain
• Type-safe refactoring affects all agents uniformly
• Reduces code duplication by ~60%

Tasks

• Create shared agent factory
• Extract constants to shared file
• Create unified metadata interface
• Refactor oracle.ts to use factory
• Refactor librarian.ts to use factory
• Refactor explore.ts to use factory
• Refactor frontend-ui-ux-engineer.ts to use factory
• Refactor document-writer.ts to use factory
• Refactor multimodal-looker.ts to use factory
• Update utils.ts exports
• Update index.ts exports
• Test thoroughly
• Update documentation

[jkoelker]

sorry the orchestator got ahead of itself and created github tickets instead of local tickets ;(