Fix payload/state bugs found in review and close NiFi + Registry tool gaps

Fix payload/state bugs found in review and close NiFi + Registry tool gaps

Merge remote-tracking branch 'origin/master'

Fix payload/state bugs found in review and close NiFi + Registry tool gaps

Fix payload/state bugs found in review and close NiFi + Registry tool gaps

Fix critical review findings and round out NiFi + Registry tool coverage

Strip project down to a pure stdio MCP server

fix

first_commit