Release v4.240.0

Added

• sticky note on eventsources, sticky note on givencontexts and sticky note on seeddata: the free-standing note of the event source, given context and seed data canvases, with the same description, colour, position and size as sticky note on personas. The syntax node carries the canvas it is on.
• position <x> <y> in an eventsource body, for tools that draw event sources as cards on a canvas. Authoring metadata only; the executable model is unchanged.
• The C# and TypeScript compilers, the printer (byte-equal round trip), the AST schema, Monaco, grammar.md and event-sources.md know the new forms; shared domain-canvases conformance vectors cover all four canvases.