[Application] align workspace shell and workflow docs

[learncold]

Summary

• align MainWindow with the documented workspace workflow by splitting the prototype into workspace, run control, runtime status, and results sections
• update the GitHub Project and contribution docs to match the current Epic structure and docs/policy PR exception rules
• keep the requested rollback of the issue form edits and the temporary Backlog project status addition out of the final change

Related Issue

• Closes Task-UI 셸과 GitHub workflow 정합화 #113

Area

• Engine
• Domain
• Application
• Docs
• Build
• Analysis
• Chore

Architecture Check

• I kept the dependency direction application -> domain -> engine.
• I did not add Qt UI code to src/domain.
• I did not add domain or application dependencies to src/engine.
• I used src/ as the include root.

Verification

• cmake --preset windows-debug
• cmake --build --preset build-debug
• ctest --preset test-debug
• Not run (reason below)

Risks / Follow-up

• The new UI shell is still a prototype scaffold; import, scenario editing, comparison, and recommendation remain placeholder sections until the corresponding domain/application tasks land.