v1.0.0

First stable release. The public API is identical to 1.0.0-rc.1 (and to the
surface shipped in 0.7.0): zero API delta through the release candidate.

From this release, versioning follows SemVer strictly: breaking changes to
the public API only in a new major version; additions in minor versions;
fixes in patch versions. The API surface is analyzer-locked
(Microsoft.CodeAnalysis.PublicApiAnalyzers), so any accidental change is a
build error.