Fixes#38
Removes the `"approved" → continue` ack-and-advance shortcut from the `human_needed` verification path in execute-phase. The phase now stays pending until `/gsd:verify-work` completes the UAT and triggers its auto-transition — enforcing the invariant that ROADMAP advances only after a completed verification record.
Also fixes: UAT file format mismatch (`status: testing` + correct `## Current Test` key shape), filename alignment (`{phase_num}-UAT.md`), explicit ack handler covering legacy `approved` keyword, stale `HUMAN-UAT.md` references in agent/reference files.
c976a9c858