Add internal-engine LiveObjects UTS unit tests

[maratal]

Stacked on feature/uts-path-based-unit-tests (the PR base).

Translates the LiveObjects UTS unit specs that exercise the internal engine directly — object_id, objects_pool, parent_references — into Swift in the UTS test target. Unlike the path-based tests (which trap on the public-API skeleton), these drive ObjectsPool / InternalDefaultRealtimeObjects / the live-object classes directly (no ably-cocoa client / mock WebSocket), so the cases covering implemented behaviour pass.

Test files (Tests/UTS/Tests/Internal)

• ObjectIdTests — RTO14 (objectId generation; pure function — passes)
• ObjectsPoolTests — RTO3–RTO9 (pool + RTO4/RTO5 sync state machine — passes, except the 3 RTO5c10 parentReferences cases, which trap)
• ParentReferencesTests — RTLO3f/4f/4g/4h, RTO5c10 (compile + trap)

The parentReferences cases bind to new notImplemented() skeletons and trap at runtime — like the path-based tests — until that API is implemented.

SDK additions

• ParentReferencing skeleton (parentReferences / addParentReference / removeParentReference / getFullPaths), conformed by InternalDefaultLiveCounter / InternalDefaultLiveMap.
• testsOnly_ hooks to drive/seed/inspect the engine: InternalDefaultRealtimeObjects.testsOnly_objectsSyncState / testsOnly_setLiveMap / testsOnly_setLiveCounter; ObjectsPool.testsOnly_setLiveMap / testsOnly_setLiveCounter; InternalDefaultLive{Map,Counter}.testsOnly_setData.

Harness + helpers (Tests/UTS)

• UTSTestCase: shared lazy objectsInternalQueue / objectsUserCallbackQueue.
• UTSTestCase+LiveObjects: makeRealtimeObjects / makePool / makeCounter / makeMap / makeCoreSDK / onQueue / flushCallbacks.
• UTSNoOpLogger, UTSMockCoreSDK.
• StandardTestPool: objectsMap / internalMapEntries builders; objectStateMessage composes the ObjectState in one call.

Deviations (deviations.md)

RTO7/RTO8 (SDK buffers only while SYNCING), RTO9a2b (object created before the unsupported-action check), RTO4b2a (no objectMessage on the update), RTLO4b4c1 (non-constructible empty counterInc), and the notImplemented() skeletons added to host parent_references / public_object_message.

🤖 Generated with Claude Code

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