docs(agents): add haskell-pro (#128)

* docs(agents): add haskell-pro

* fixup

* Move haskell-pro agent to functional-programming plugin

- Moved plugins/haskell-development/agents/haskell-pro.md to plugins/functional-programming/agents/haskell-pro.md
- Updated path reference in docs/agents.md

This addresses review feedback to place the Haskell agent in the existing functional-programming plugin alongside elixir-pro, rather than creating a new haskell-development plugin.

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

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

---------

Co-authored-by: Claude <noreply@anthropic.com>

docs/agents.md

@@ -65,6 +65,7 @@ Complete reference for all **86 specialized AI agents** organized by category wi
 | [elixir-pro](../plugins/functional-programming/agents/elixir-pro.md) | sonnet | Elixir with OTP patterns and Phoenix frameworks |
 | [django-pro](../plugins/api-scaffolding/agents/django-pro.md) | sonnet | Django development with ORM and async views |
 | [fastapi-pro](../plugins/api-scaffolding/agents/fastapi-pro.md) | sonnet | FastAPI with async patterns and Pydantic |
+| [haskell-pro](../plugins/functional-programming/agents/haskell-pro.md) | sonnet | Strongly typed functional programming with purity, advanced type systems, and concurrency |
 | [unity-developer](../plugins/game-development/agents/unity-developer.md) | sonnet | Unity game development and optimization |
 | [minecraft-bukkit-pro](../plugins/game-development/agents/minecraft-bukkit-pro.md) | sonnet | Minecraft server plugin development |
 | [sql-pro](../plugins/database-design/agents/sql-pro.md) | sonnet | Complex SQL queries and database optimization |