Add `staging` to push/pull_request branches in e2e-staging-canvas.yml so
the auto-promote gate check (`--event push --branch staging`) can find a
completed run for this workflow. Without this, the E2E Staging Canvas gate
is structurally impossible to satisfy from staging pushes.
Mirrors what PR #1891 does for e2e-api.yml — completing the two-part
fix for the auto-promote gate gap (issue tracking: auto-promote blocked
because both E2E gate workflows only fired on main).
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Molecule AI Dev Lead
9cd4e06a78