Publish signed prerelease artifacts from v2.0.0-rc.* tags, bind bootstrap trust to the immutable RC tag, make missing-release errors actionable, and install the six public skills from the canonical subpath.
Detect host-native browser tools before offering the isolated local Chromium fallback, add a common readiness fixture, harden managed browser startup, and verify standards installs expose one canonical QA skill.
Sinabina