feat: add title field to MCP type schemas

Add optional title field to core MCP types:
- Tool: For human-readable tool display names
- Resource: For human-readable resource display names
- ResourceTemplate: For human-readable template display names
- Prompt: For human-readable prompt display names
- Implementation: For human-readable implementation display names

The title field provides a way to display user-friendly names in UIs
while keeping programmatic names stable. All fields are optional to
maintain backwards compatibility.

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

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

Author: felixweinberger

src/mcp/types.py

@@ -201,6 +201,8 @@ class Implementation(BaseModel):
     """Describes the name and version of an MCP implementation."""
 
     name: str
+    title: str | None = None
+    """A human-readable title for the implementation."""
     version: str
     model_config = ConfigDict(extra="allow")
 
@@ -382,6 +384,8 @@ class Resource(BaseModel):
     """The URI of this resource."""
     name: str
     """A human-readable name for this resource."""
+    title: str | None = None
+    """A human-readable title for this resource."""
     description: str | None = None
     """A description of what this resource represents."""
     mimeType: str | None = None
@@ -407,6 +411,8 @@ class ResourceTemplate(BaseModel):
     """
     name: str
     """A human-readable name for the type of resource this template refers to."""
+    title: str | None = None
+    """A human-readable title for the type of resource this template refers to."""
     description: str | None = None
     """A human-readable description of what this template is for."""
     mimeType: str | None = None
@@ -584,6 +590,8 @@ class Prompt(BaseModel):
 
     name: str
     """The name of the prompt or prompt template."""
+    title: str | None = None
+    """A human-readable title for the prompt."""
     description: str | None = None
     """An optional description of what this prompt provides."""
     arguments: list[PromptArgument] | None = None
@@ -766,6 +774,8 @@ class Tool(BaseModel):
 
     name: str
     """The name of the tool."""
+    title: str | None = None
+    """A human-readable title for the tool."""
     description: str | None = None
     """A human-readable description of the tool."""
     inputSchema: dict[str, Any]