docs: revise CoreJS Interview #2 — focus on Stage 2, remove duplicates

[dzmitry-varabei]

Summary

• Revise CoreJS Interview Float exercise #2 to fit the target 45-90 min (was 170+ min — one mentor spent 4+ hours trying to cover everything)
• Remove 12 theoretical sections: Stage 1 topics (OOP, Classes, Prototypes, Modules, Callbacks/IIFE), non-JS topics (Methodologies, Testing, Web Security), legacy content (XMLHttpRequest, user agent parsing)
• Expand under-represented Stage 2 topics: TypeScript (utility types / type guards now required), Async/Event Loop (from 2 bullets to full section with subsections), Functional Programming (new section)
• Remove 8 coding tasks: 3 duplicates with Interview Positioning #1 (Array.flat, Array.reduce, String.repeat), 5 redundant/trivial. Add 2 new tasks: Debounce, EventEmitter
• Add interviewer guidance: "pick 1-2 tasks", time estimates, curriculum context notes
• Preserve old version as interview-corejs-legacy.md
• Add detailed changelog with justification: interview-corejs-changelog.md (in Russian)

Files

File	Action
tasks/interview-corejs.md	Revised (18 sections → 6, 15 tasks → 7)
tasks/interview-corejs-legacy.md	New — old version preserved for reference
tasks/interview-corejs-changelog.md	New — detailed rationale for every change

Test plan

• Read interview-corejs-changelog.md — verify each removal/addition is justified
• Read interview-corejs.md — verify it covers core Stage 2 topics
• Verify no overlap with interview-basic-coreJS.md (Interview Positioning #1)
• Verify all internal links between the 3 files work

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