Add UTS tests for LiveObjects path-based API

[paddybyers]

Summary

• Translates portable UTS test specs from specification/uts/objects/ into 290 working ably-js TypeScript tests
• Covers PathObject, Instance, batch operations, LiveCounter/LiveMap CRDT internals, ObjectsPool sync state machine, RealtimeObject lifecycle, value types, and subscriptions
• 19 test files: 14 unit (270 tests), 4 integration (15 tests), 1 proxy fault injection (5 tests)
• 1 test pending (LiveMap#clear() not yet implemented in ably-js)

Test plan

• All 290 tests pass locally: npx mocha --no-config --require tsx/cjs 'test/uts/objects/**/*.test.ts' --timeout 60000
• CI passes

🤖 Generated with Claude Code

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch uts-liveobjects

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