M2M relationship form widgets

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What changed

• A many-to-many relationship declared with a form widget (e.g. multiple-select) now generates a working FormControl named <singular>Ids: string[]. Previously the control was omitted and Angular threw Cannot find control with name: <singular>Ids at runtime.
• Edit-mode forms project the denormalized read shape (<plural>: T[]) into the <singular>Ids control on reset, and the detail/list configs emit the matching include so the related data loads.

Why it matters

The many-to-many-via-form pathway is usable end to end: declare a widget on an m2m property in YAML and the generated form just works — no post-generation hand-editing, and no need to disable the widget. The applicationIds: [ID] write contract over the GraphQL boundary is preserved; the read/write shape translation lives in the form, not in the aggregate or repository.

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