v0.15.0

• v0.15.0
• fix: let release.sh own the server.json bump
• docs: promote [Unreleased] to 0.15.0 and sync server.json
• docs: add CHANGELOG.md
• feat(runtime): prefer oam, fall back to Node (#40)
• docs(release): correct the CI-history citation in the IS_CI comment (#39)