Record the vocabulary node types in the roadmap

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_011LF61rxW1FG5YCD2J9YqjY

ROADMAP.md

@@ -33,6 +33,10 @@ external interfaces. See `docs/architecture/structure.canvas` → *Backend – M
 - [x] Flow engine in `backend/app/flow/`: `Node` / `Pipeline` / `StateBackend`
       (memory + Redis) / `FlowController`
 - [x] Node types: HTTP, MQTT, InfluxDB, Delay, MLP
+- [x] Flow-logic vocabulary as node types rather than repeated code: inject (manual,
+      interval, cron or at startup), switch, change, filter-unchanged, join, trigger,
+      command, file and ntfy. Each is configured by filling in a form the editor
+      generates from its parameter schema
 - [x] `app/flow` is an importable package with absolute `app.flow.*` imports
 - [x] Typed, serializable node I/O: every port declares a `DType`, messages are
       JSON on the wire and in Redis, no pickle anywhere. Binary codecs are still