posthog-v7.42.0

Minor changes

• f483bab feat(mcp): capture $mcp_client_user_agent and $mcp_vendor_client so MCP usage can be attributed to a product surface. clientInfo.name only says which client library is calling — Anthropic reports claude-code from the CLI, the Agent SDK, the VS Code extension and the desktop app alike — so $mcp_client_name collapses every surface into one bucket and the harness breakdown reads 100% "Other" for Python-backed servers. The distinguishing detail lives in the User-Agent parenthetical (claude-code/2.1.0 (cli) vs (sdk-ts)) and in vendor headers like x-anthropic-client. Both are captured raw and classified at query time, so labels can improve without an SDK release. HTTP transports only: stdio and in-memory servers carry no headers and their events are unchanged. Custom dispatchers pass their own via new client_user_agent / vendor_client arguments on every PostHogMCP.capture_* method. Parity with @posthog/mcp. — Thanks @gesh!