Extend schema-drift test to all schema-paired types

[AimTune]

packages/core/src/domain/value-objects/__tests__/schema-drift.test.ts mechanically guards ThemeConfig and its sub-objects (colors, layout, avatar, end-of-conversation survey) against schemas/theme.schema.json. The same drift policy is documented in AGENTS.md → Schema Sync Rule for every other JSON-serialisable type — but only ThemeConfig has the test. We want the same protection for the rest.

Tasks

• Connector option types — pair each Options interface with its schema:
  • WebSocketConnectorOptions ↔ schemas/connectors/websocket.schema.json
  • SignalRConnectorOptions ↔ schemas/connectors/signalr.schema.json
  • DirectLineConnectorOptions ↔ schemas/connectors/directline.schema.json
  • SseConnectorOptions ↔ schemas/connectors/sse.schema.json
  • HttpConnectorOptions ↔ schemas/connectors/http.schema.json
  • DummyConnector constructor options ↔ schemas/connectors/dummy.schema.json
• Domain entities and value objects:
  • IncomingMessage ↔ schemas/messages/incoming-message.schema.json
  • OutgoingMessage ↔ schemas/messages/outgoing-message.schema.json
  • MessageAction ↔ schemas/messages/message-action.schema.json
  • HistoryResult ↔ schemas/messages/history-result.schema.json
  • Conversation ↔ schemas/messages/conversation.schema.json
  • SurveyPayload ↔ schemas/messages/survey-payload.schema.json
  • AIChunk (union) ↔ schemas/genui/ai-chunk.schema.json

Approach

Each new test follows the same pattern as the existing one:

const EXPECTED: { [K in keyof Required<T>]: true } = { /* ... */ };
expect(keys(schema.properties)).toEqual(keys(EXPECTED));

The mapped-type contract catches TS-only drift; the JSON read catches schema-only drift. For AIChunk's discriminated-union case, iterate schema.oneOf[*].properties and compare each variant.

Some connectors live outside @chativa/core — the test for them belongs in their own package's __tests__ folder, not in core, to avoid a cross-package import.

Acceptance criteria

• One drift test per type listed above.
• All tests pass on pnpm test.
• Updating the type without the schema fails typecheck or the test.

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Spun out of todos.md.