feat: implement MCP streamable HTTP server

TASKS.md

@@ -2,21 +2,21 @@
 
 ## Current
 
-### `feat/ui-v1`
+### `feat/mcp-server`
 
 Status: completed
 
 DoD:
 
-- UI covers operation list, create, test, sample upload, draft generation and publish
-- UI works against `admin-api` without mock backend
-- critical form helpers are covered by frontend tests
-- production UI build works in Docker container
-- CI checks UI build and tests together with Rust workspace
+- `mcp-server` exposes a single MCP HTTP endpoint
+- initialize and initialized lifecycle work with session handling
+- tools are listed and called through MCP JSON-RPC methods
+- published tool catalog refreshes without service restart
+- MCP integration tests cover initialize, list, call and refresh flow
 
 ## Next
 
-- `feat/mcp-server`
+- `feat/graphql-support`
 
 ## Backlog