docs: add governance

CONTRIBUTING.md

@@ -17,3 +17,8 @@ Coming soon.
 ## Code of Conduct
 
 We follow standard open source community norms. Be respectful, constructive, and collaborative.
+
+## Governance
+
+See [GOVERNANCE.md](GOVERNANCE.md) for maintainers, decision making,
+contributor recognition, and blueprint curation.

GOVERNANCE.md

@@ -0,0 +1,33 @@
+# Governance
+
+## Maintainers
+
+`@nojibe` is the current maintainer. Contributors are recognized in
+[CONTRIBUTORS.md](CONTRIBUTORS.md), and the list is updated as contributions
+land.
+
+## Decision making
+
+- Ordinary PRs follow the review process in
+  [CONTRIBUTING.md](CONTRIBUTING.md).
+- Significant design changes are discussed on an issue or PR before merging.
+- Escalation happens by commenting on the relevant issue or PR; maintainers
+  aim to respond in a reasonable time.
+- Releases and public blueprint curation are maintainer responsibilities.
+
+## Contributor recognition
+
+- A contributor is added to [CONTRIBUTORS.md](CONTRIBUTORS.md) after their
+  first merged PR.
+- The recognition update is a normal PR, submitted by the contributor or by a
+  maintainer, and is reviewed like any other change.
+- The process is intentionally lightweight and does not depend on a bot.
+
+## Blueprint curation
+
+- Community blueprints can be proposed through the Sandbox Studio or as a PR
+  to the public configs repository.
+- Every blueprint must follow
+  [BLUEPRINT_FORMAT.md](docs/BLUEPRINT_FORMAT.md).
+- Maintainers review blueprints for safety, clarity, and reproducibility
+  before they are accepted into the public library.