Elicitation - protocol version 2025-11-25 #540

Protocol 2025-11-25 extends elicitation with form/url modes and a restricted primitive JSON Schema subset. These types are missing and ElicitRequestParams does not model mode, task, or the schema variants.

• Add types:

  • ElicitRequestFormParams
  • ElicitRequestURLParams
  • BooleanSchema
  • NumberSchema
  • StringSchema
  • EnumSchema
  • SingleSelectEnumSchema
  • MultiSelectEnumSchema
  • TitledSingleSelectEnumSchema
  • TitledMultiSelectEnumSchema
  • UntitledSingleSelectEnumSchema
  • UntitledMultiSelectEnumSchema
  • LegacyTitledEnumSchema
  • PrimitiveSchemaDefinition

• Update ElicitRequestParams to be a union of form/url params.

• Support mode, task, _meta.progressToken, and restricted top‑level schema.

• Update serializers and DSL builders