docs(n8n-webhook): add operator approval runbook

HANDOFF.md

@@ -4,7 +4,7 @@
 Immediate baton-pass for the next fresh implementation session.
 
 ## Current objective
-Run operator/polish pass (3/3): tighten operator docs, approval policy clarity, recurring verification flow, and low-noise execution reporting now that Gmail + Calendar passes are complete.
+Operator/polish pass is complete. Next fresh session should decide whether Drive / Docs / Sheets need action-bus verbs at all, while preserving the approval/history contract that now exists for Gmail + Calendar.
 
 ## Use these state files first
 1. `WIP.md` — full standing plan and checkpoints
@@ -59,14 +59,13 @@ Run operator/polish pass (3/3): tighten operator docs, approval policy clarity,
 - Added docs/test payloads/validator coverage for the expanded calendar contract.
 
 ## Highest-priority next actions
-1. Add a compact operator command/reference section for common approval flows.
-2. Add one or two canned recurring verification flows (queue → approve → verify → cleanup).
-3. Decide/document approval defaults clearly per action family.
-4. Improve low-noise execution/result reporting in approval history.
+1. Decide whether Drive / Docs / Sheets need action-bus verbs or should stay direct-tool only.
+2. If new Google actions are added, keep approval defaults explicit by family (`notification`, `gmail`, `calendar`, `manual`).
+3. Preserve compact operator reporting (`pending_compact`, `history_compact`, `summary_line`, `result_refs`) for any new approval-backed actions.
 
 ## Success criteria for the next session
-- Operator/polish pass completed with docs/playbook/history-reporting improvements.
-- Approval defaults are explicit and easy to skim.
+- Clear go/no-go decision on expanding beyond Gmail + Calendar.
+- Any new verbs inherit the same safe approval defaults and low-noise history contract.
 - `WIP.md` and memory updated with concrete evidence.
 - Meaningful commit(s) captured.