Are there any public policy analysis sites that focus on legislation, government decisions, and policy debates?

Yes — there are several public policy analysis sites that focus on legislation, government decisions, and policy debates. Here are some well-known ones:

U.S.-focused

• Brookings Institution — In-depth policy research and commentary on legislation and government action.
  https://www.brookings.edu/
• RAND Corporation — Research on public policy, defense, health, education, and more.
  https://www.rand.org/
• Urban Institute — Policy analysis especially on social and economic issues.
  https://www.urban.org/
• The Heritage Foundation — Conservative policy analysis and legislative commentary.
  https://www.heritage.org/
• Cato Institute — Libertarian policy analysis on government and regulation.
  https://www.cato.org/
• Center for American Progress — Progressive policy analysis and political commentary.
  https://www.americanprogress.org/
• Bipartisan Policy Center — Policy analysis aimed at bipartisan legislative solutions.
  https://bipartisanpolicy.org/

Journalism / policy tracking

• Politico — Strong coverage of legislative and government policy debates.
  https://www.politico.com/
• The Hill — Focuses heavily on Congress, legislation, and policy fights.
  https://thehill.com/
• Ballotpedia — Tracks legislation, elections, and policy issues in a structured way.
  https://ballotpedia.org/

Research / comparative policy

• OECD Policy Papers — Policy analysis across countries, especially economic and social policy.
  https://www.oecd.org/
• Institute for Government (UK) — Government decision-making and public policy analysis.
  https://www.instituteforgovernment.org.uk/

If you want, I can also give you:

1. the best sites by topic (health, education, taxes, immigration, etc.), or
2. the most neutral/nonpartisan ones.