feat: add 5 more leetcode problems

[wislertt]

Summary

• Add 5 new LeetCode problems (9. Palindrome Number, 13. Roman to Integer, 14. Longest Common Prefix, 16. 3Sum Closest, 32. Longest Valid Parentheses) with JSON templates, generated scaffolds, and optimal solutions
• Sync 22 pre-existing problems whose generated README.md/playground.py had drifted from the JSON source of truth
• Update dependencies

Changes

1. Add 5 LeetCode problems

src/leetcode_py/cli/resources/leetcode/json/problems/{palindrome_number,roman_to_integer,longest_common_prefix,three_sum_closest,longest_valid_parentheses}.json + leetcode/<problem>/*

Each problem ships a JSON template (source of truth) plus the full generated scaffold — README.md, solution.py, helpers.py, test_solution.py, playground.py, __init__.py. Solutions implemented optimally:

• 9. Palindrome Number (Easy) — reverse half the integer, O(log n) time / O(1) space, no string conversion
• 13. Roman to Integer (Easy) — right-to-left scan subtracting smaller-before-larger symbols, O(n) / O(1)
• 14. Longest Common Prefix (Easy) — vertical character scan across all strings, O(S) / O(1)
• 16. 3Sum Closest (Medium) — sort + two-pointer nearest-sum, O(n²) / O(1)
• 32. Longest Valid Parentheses (Hard) — index stack seeded with -1, O(n) / O(n)

tags.json5 registers all five under the grind tag (alphabetically sorted); bakefile.py problem field set to longest_valid_parentheses. Each problem has 16 parametrized test cases.

2. Sync drifted generated files

leetcode/{alien_dictionary,cheapest_flights_within_k_stops,counting_bits,evaluate_reverse_polish_notation,find_all_anagrams_in_a_string,house_robber,house_robber_ii,is_graph_bipartite,longest_substring_without_repeating_characters,lru_cache,majority_element,merge_triplets_to_form_target_triplet,n_queens,non_overlapping_intervals,number_of_provinces,single_number,single_number_iii,subarray_sum_equals_k,two_sum_ii_input_array_is_sorted,valid_anagram,valid_parenthesis_string,word_search_ii}/

Regenerated README.md and playground.py for 22 existing problems so they match the JSON templates. Drift was caused by an earlier generator change that stopped escaping * in constraint lines (e.g. 3 \* 10^4 → 3 * 10^4); valid_parenthesis_string also picked up a trailing-whitespace fix. solution.py is excluded from the consistency check and was restored untouched. bake check-consistency now passes.

3. Update dependencies

• bakefile[lib] bumped >=0.0.8 → >=0.0.57a0 (prerelease)
  • pyproject.toml, uv.lock
• Adds [tool.uv] index-strategy = "unsafe-best-match" / prerelease = "explicit" config and a test-pypi source for bakefile

Test plan

• bake lint passes (ruff, ty, deptry, actionlint, sort_tags)
• bake check-consistency passes — all generated files match JSON source of truth
• bake p-test -p <each new problem> — 16/16 tests pass per problem

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

🎉 This PR is included in version 0.47.0 🎉

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