[jmunar]

Summary

• Add 40 new difficulty-3 items to the data-science Challenges deck, bringing it from 122 to 162 entries across all four tracks (ML fundamentals, metrics, statistics, LLMs).
• Extend the deck's README with the new per-track counts, topics and the review status of the added items.
• Add a regression test that rejects duplicate questions in the committed deck.
• Update the docs and roadmap to reflect the 162-item deck and the outstanding human review.
• Ignore RUSTSEC-2026-0387 in cargo audit until web-push accepts jwt-simple 0.13; the advisory is a timing issue in crypto-bigint 0.5.5, reached only through VAPID ES256 signing with our own push key.

Test plan

• make check (passes, including the deck validation and cargo audit).
• cargo test -p myapps-challenges-prep the_committed_data_science_deck_reads confirms 162 items, 4 subjects and every difficulty level present.
• cargo audit passes with the documented ignore.
• Optional: cargo run --release -p myapps-challenges-prep -- bundle data-science and inspect the generated bundle.

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