v0.8.0

Added

• Content::EmbeddedResource class for embedded resource content type (#244)
• Content::Audio class for audio content type (#243)
• $ref support in Tool::Schema for protocol version 2025-11-25 (#242)
• MCP conformance test suite (#248)

Fixed

• Handle Errno::ECONNRESET in SSE stream operations (#249)
• Fix default handler return values to comply with MCP spec (#247)
• Fix Prompt#validate_arguments! crash when arguments are nil (#246)
• Return 202 Accepted for SSE responses per MCP spec (#245)
• Fix Content::Image#to_h to return mimeType (camelCase) per MCP spec (#241)