fix(fable-mcp): fix send_message to use correct two-step API flow

POST .../messages to start generation, then stream from .../generation/stream.
The previous implementation used a non-existent /stream endpoint.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

fable-mcp/pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "fable-mcp"
-version = "0.2.1"
+version = "0.2.2"
 description = "MCP server for Fabled Assistant"
 requires-python = ">=3.12"
 dependencies = [