af6fa169b7
Eliminates the dual-process bug where multiple Claude Code sessions each spawn their own whetstone_mcp stdio process with split in-memory state. All sessions now share a single persistent daemon via MCP HTTP+SSE transport. Changes: - MCPHttpServer.h: HTTP+SSE transport (cpp-httplib via FetchContent). GET /sse streams events per session, POST /message routes JSON-RPC, GET /health for status. Thread-safe session map with mutex/cv/queue. - MCPBridge.h: adds runHttp(port, workspace) method - mcp_main.cpp: --daemon/--port flags, daemon.pid lockfile, duplicate guard - CMakeLists.txt: FetchContent for cpp-httplib, step1983-1987 targets - tools/start-whetstone-daemon.sh: idempotent startup, health-check poll - 5/5 tests passing (step1987_test) Note: Documents/.mcp.json switched to SSE transport in working directory (not tracked in this repo). Daemon must be started before Claude Code sessions. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>