Migrate LabKit apps to UI 2.0

[Pluze]

Summary

• add the UI 2.0 declarative app/spec/view foundation and migrate all target LabKit apps to app-local buildSpec plus package-root run.m runners
• remove the legacy app-facing UI surface, +ui/runApp lifecycle runners, empty expected-debt inventories, and migration-period docs/test backdoors
• align docs, AGENTS, skills, public-surface guardrails, app structure guardrails, and launcher behavior with the final UI 2.0 contract

Validation

• scripts/run_matlab_tests.sh testLabkitUiGui
• scripts/run_matlab_tests.sh testAppsSmokeGui
• scripts/run_matlab_tests.sh testAppsGui
• scripts/run_matlab_tests.sh testProject checkStyle
• scripts/run_matlab_tests.sh testProject
• scripts/run_matlab_tests.sh test
• GitHub Actions MATLAB Tests: success on da78db4

Manual GUI risk

• automated GUI coverage is structural/noninteractive; full interactive file selection, drawing, and visual workflow feel remain user-manual validation per docs/testing.md