Slice 7 (deferred) — a module with workflow

STUB. DEFERRED. Activiti is wired into the codebase (xlyFlow module, act_* schema, two Activiti versions in xlyPersist/xlyFlow), but the workflow tables (act_re_procdef, act_ru_task, act_hi_procinst, biz_flow, biz_todo_item, gdsmoduleflow, sysflowsendtointerface) populate only in deployments that actually run an approval flow — and exercising the slice end-to-end needs such a deployment.

Originally this was Slice 2; the slot was reassigned to multi-tenancy, which is observable everywhere. This slice will be filled when a deployment with active flows is available, or when we choose to document Activiti as a code-derived hypothesis only.

Outline (when ready):

1. A module with an approval/review step (e.g., quotation → review → sales order).
2. The Activiti tables: act_re_* (definitions), act_ru_* (running), act_hi_* (history); the version skew (5.17 in xlyPersist, 6.0 in xlyFlow).
3. xly's wrapper layer: biz_flow, biz_todo_*, gdsmoduleflow, CheckFlowController.
4. The end-to-end trace from "click submit" → process instance start → task assignment → approver action → process complete.