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    Class WriteEntityFieldsAction

    Generic action that writes one or more fields onto a single entity record — either an existing record (identified by its primary key) or a brand-new one (when CreateIfMissing is true and no primary key is supplied).

    Designed to be reused both by Flow Agents (as a discoverable tool) and as the terminal "write the result back" step of a Feature Pipeline. It mirrors the existing Create/Update Record actions but collapses the create-or-update decision into a single declarative call: give it the target, an optional key, and a field map, and it does the right thing.

    Strong typing note: where a generated entity subclass exposes typed setters we would prefer them, but the field set here is supplied dynamically at runtime (the entity itself is a parameter), so there is no compile-time type to bind to. BaseEntity.Set() is the correct — and intended — write path for this one legitimately-dynamic case. We still validate each field exists on the entity before writing, so typos surface as explicit errors rather than silent no-ops.

    // Update two fields on an existing record
    await runAction({
      ActionName: 'Write Entity Field(s)',
      Params: [
        { Name: 'EntityName', Value: 'MJ: AI Agents' },
        { Name: 'PrimaryKey', Value: { ID: '123e4567-e89b-12d3-a456-426614174000' } },
        { Name: 'Fields', Value: { Status: 'Active', Description: 'Updated by pipeline' } }
      ]
    });

    // Create a new record when none exists
    await runAction({
      ActionName: 'Write Entity Field(s)',
      Params: [
        { Name: 'EntityName', Value: 'MJ: AI Agents' },
        { Name: 'CreateIfMissing', Value: true },
        { Name: 'Fields', Value: { Name: 'My Agent', Status: 'Active' } }
      ]
    });

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