feat(tools): add OOP C# code generation tools

[CalvinAllen]

Description

Add structured C# code generation/mutation tools powered by Roslyn that allow AI assistants to create, update, and delete C# code elements at a semantic level — rather than raw text editing via document_write/editor_replace.

Tools to Implement

Type Management

Tool	Description
cs_create_type	Create a new class, struct, record, interface, or enum in a specified file/namespace
cs_delete_type	Remove a type declaration from a file
cs_rename_type	Rename a type with Roslyn rename support (updates all references)
cs_modify_type	Change type modifiers (sealed, abstract, static, partial), base types, or implemented interfaces

Member Management

Tool	Description
cs_add_method	Add a method to a type with full signature and body
cs_update_method	Update a method's signature, body, or modifiers
cs_delete_method	Remove a method from a type
cs_add_property	Add a property with optional getter/setter/init bodies
cs_update_property	Update a property's type, accessors, or modifiers
cs_delete_property	Remove a property from a type
cs_add_field	Add a field with optional initializer
cs_update_field	Update a field's type, modifiers, or initializer
cs_delete_field	Remove a field from a type

Constructor and Event Management

Tool	Description
cs_add_constructor	Add a constructor with parameters and body
cs_update_constructor	Update constructor parameters or body
cs_delete_constructor	Remove a constructor
cs_add_event	Add an event declaration
cs_delete_event	Remove an event

Attribute and Using Management

Tool	Description
cs_add_attribute	Add an attribute to a type or member
cs_remove_attribute	Remove an attribute from a type or member
cs_add_using	Add a using directive to a file
cs_remove_using	Remove a using directive from a file

Enum Members

Tool	Description
cs_add_enum_member	Add a member to an enum with optional value
cs_delete_enum_member	Remove an enum member

Batch Operations

Tool	Description
cs_batch	Execute multiple code generation operations in a single transaction

Notes

• All operations should use Roslyn SyntaxNode manipulation for correctness (proper formatting, trivia preservation)
• Operations should respect existing code style (indentation, brace placement)
• Batch mode allows multiple mutations atomically to avoid intermediate broken states
• Complements feat(tools): add Roslyn-based deep C# analysis tools #82 (Roslyn analysis) — analysis tools inspect, these tools mutate
• Competitor reference: RoslynMcp cs tool (86 actions)