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* fix(mcp): handle 202 Accepted for Streamable HTTP notifications The MCP Streamable HTTP spec requires servers to respond with 202 Accepted (empty body) for JSON-RPC notifications like `notifications/initialized`. The HTTP transport tried to parse this empty body as JSON, which failed and broke the session handshake — subsequent requests like `tools/list` were rejected because the server considered the session uninitialized. Add an early return for 202 responses that produces an empty McpResponse without attempting body parsing. Fixes #1436 Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]> * fix(mcp): wire session manager into transport for non-OAuth HTTP clients The factory used McpClient::new_with_config().with_session_manager() which only set the session manager on the client, not on the HttpMcpTransport. The transport never captured Mcp-Session-Id from responses, so subsequent requests lacked the header and the server rejected them as uninitialized. Fix by constructing the HttpMcpTransport with the session manager before wrapping it in Arc, matching the pattern already used by new_authenticated(). Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]> * refactor(mcp): deduplicate factory HTTP path, gate dead-code methods as test-only - Collapse the two identical non-OAuth HTTP branches in `create_client_from_config()` into one (early-return for the authenticated path, fall through for the common case). - Gate `McpClient::new_with_config()` and `McpClient::with_session_manager()` as `#[cfg(test)]` — the factory was their only production caller and no longer uses them. Both methods silently skip wiring the session manager into the transport, which was the root cause of #1436. - Add doc warnings on both methods explaining the footgun. Co-Authored-By: Claude Opus 4.6 (1M context) <[email protected]> --------- Co-authored-by: Claude Opus 4.6 (1M context) <[email protected]> Co-authored-by: [email protected] <[email protected]>