docs: rewrite solutions guide with deeper explanations for all 65 questions
Expand every entry with a concept section explaining the underlying mechanism, exact commands/YAML pulled from tracks/cka/solutions.py, and gotchas tied to what each question's grader checks actually verify. Doc grows from ~750 to ~1540 lines. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
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