Single autonomy-control surface (--gates) added to ultrabrief, ultraresearch,
ultraplan, and ultraexecute. When present, sets gates_mode = true and
re-enables approval pauses at every phase boundary + every wave for
high-stakes runs. When absent (default in auto), the chain runs continuously
to the main-merge gate (which always pauses regardless of --gates — that
boundary is the one always-on safety stop).
ultrabrief: pause after auto-mode confirmation; emit brief-approved event
ultraresearch: pause after each topic completes
ultraplan: pause after Phases 5, 7, 9
ultraexecute: pause after each wave's worktrees finish, before merge-back,
AND before the main-merge gate (MAIN_MERGE_GATE)
All four commands invoke the autonomy-gate state machine via the CLI shim
node lib/util/autonomy-gate.mjs (built in S8). Test pin in
tests/lib/gates-flag-coverage.test.mjs locks the contract.
Also wires the brief-approved stats emission into ultrabrief Phase 5 auto
path (was the SC4 wiring requirement from plan-v2 Step 11).
