Запрос на слияние 'work' (#2) из work в master

create README.md

create spec/codex.md

create demo/artrifacts.txt

update spec/workflow.md

create README.md

create spec/codex.md

create demo/artrifacts.txt

update spec/workflow.md

update spec/vision.md

update spec/tasks.md

update spec/docs.md

update spec/PRD.md

create dev/solution.cs

delete scripts/MATPLOTLIB_CHEATSHEET.md

delete scripts/CODE_REQUIREMENTS.md

delete scripts/PANDAS_CHEATSHEET.md