refactor(test): redesign pass for the DevicePipeline gate design

The standard device-API test pipeline (#8 (closed)) was merged to main and reverted the same day (commit 81936389 reverting 6ff82544); the current implementation lives on the exp lineage and reaches main for the first time with v0.3.0. Its ten-gate design (mock gates mixed with the optional hardware gates 9–10) has never been exercised from a main release by hub modules and needs a redesign pass. Feeds the milestone outcome Device API testing & verification standard.