GitHubBar validation 0.1.0 (3)

Third installable validation build of the complete MVP. Includes the fixed-position refresh status, sidecar repository picker, corrected My PRs divider, and all reconciliation/release hardening from validation build 2.

This artifact is universal (arm64 + x86_64), ad-hoc signed, and intentionally not notarized. See the bundled VALIDATION-README.md before installation.