CHUMANA SERVICELINK V3.7.3 — WORKFLOW RUNTIME BUILD 1

Adds:
- WorkflowRuntime engine
- WorkflowStateService
- controlled stage advancement
- pause/resume/cancel runtime operations
- immutable transition history
- assignment and workflow notification tables
- administrator Workflow Monitor
- upgrade-v373.php installer

Install:
1. Back up files and database.
2. Extract PATCH over public_html/chumana.
3. Sign in as administrator.
4. Open /chumana/upgrade-v373.php.
5. Install, then open Workflow Monitor.

This build intentionally does not yet replace every legacy job-status action. It establishes and verifies the production runtime first. Marketplace action integration follows in Build 2.
