add help docs and ?

docs/nodes/Text Note.md

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+# Text Note
+
+A floating text card for annotating workflows. Supports Markdown formatting. Does not process data and has no outputs.
+
+## Inputs
+
+None.
+
+## Outputs
+
+None.
+
+## Controls
+
+| Name | Type | Default | Description |
+|------|------|---------|-------------|
+| text | STRING (multiline) | "# Guide\n\nDouble-click to edit this note.\n\n- Step 1\n- Step 2" | Markdown text displayed on the canvas card |
+| color | dropdown | default | Card background color: default, blue, green, yellow, red, or purple |
+
+## Limitations
+
+- None.