v2.0.90

Core

• File lease: a timed-out wait names its holder (#585)
• Fix stale inference connections, optional tool inputs and local result links (#584)
• Authority: a gap resyncs only when it named this project (#583)
• Launch polish: README, contributor guide, Homebrew retired, repo tidy, single-call rows (#582)

The Windows desktop installer is unsigned while Microsoft Artifact Signing setup is incomplete.