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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vumast3r 2026-09-10 21:05:35 -06:00
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