feat: add 221 problems and self-updating problem counts

[wislertt]

Summary

• Add 221 new LeetCode problems: JSON templates plus fully generated practice environments (531 total, up from 307)
• Make the advertised problem count self-updating via generated markers in README and docs
• Add four new troubleshooting docs pages
• Update dependencies

Changes

1. 221 new problems

src/leetcode_py/cli/resources/leetcode/json/problems/, leetcode/

Each new problem ships a JSON template plus the six generated files (README, solution stub, parametrized test suite, helpers, playground, package init), sourced from the NeetCode roadmap expansion and other lists. tags.json5 grows by ~213 lines to register the new problems across the collections, and the generated catalog pages (catalog/all.mdx, catalog/neetcode.mdx) expand accordingly to 531 entries. This batch also removes three unsolvable test cases from the two_sum template (expected [] violates the problem's guarantee of exactly one solution).

2. Generated problem counts in hand-written prose

scripts/gen_catalog.py, README.md, docs/index.mdx, docs/getting-started/why-leetcode-py.mdx

gen_catalog.py now injects the exact problem count (531) into three hand-written files via start/end comment markers, replacing the stale hardcoded "300+". README.md uses HTML comments; the .mdx files use JSX comments since MDX rejects HTML comment syntax. Because bake lint (a pre-commit hook) runs the generator, any count drift now fails CI until the regenerated files are committed, with --check available for verification-only runs.

3. Troubleshooting docs

docs/troubleshooting/, docs/docs.json

Four new pages: unknown-problem, files-already-exist, graphviz-missing, and notebook-cells, plus a reworked troubleshooting index and nav entries.

4. Agent workflow tooling

.claude/skills/, .claude/.dev/, bakefile.py, .mise.toml

Updates to the problem-creation, batch-problem-creation, test-quality-assurance, and update-tags skills; a new .claude/.dev/insert_tag.py helper; the unscrapable problem queue list; and a pinned bakefile install with locked extras.

5. Update dependencies

• Lockfile churn from dependency refreshes (uv.lock) and 307 regenerated playground.py conversions from the notebook-to-python lint hook.

Test plan

• bake lint passes (ty, ruff, deptry, actionlint, generated catalog freshness)
• bake check-consistency passes: generated files match JSON source of truth
• bake check-test-cases reports 0 problems at or below the 10-case threshold
• bake p-test passes for the three problems that received additional test cases

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Project	Status	Preview	Updated (UTC)
leetcode-py	🟢 Ready	View Preview	Aug 31, 2026, 2:09 AM

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[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
0.1% Duplication on New Code

See analysis details on SonarQube Cloud

[github-actions]

🎉 This PR is included in version 1.0.6 🎉

The release is available on GitHub release

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