[WM-BW-9] Control inheritance sub-page blank — no workflow to document Common Control Provider inheritance

## WM-BW-9 — Control Inheritance Sub-page Blank; SP 800-37 Task I-2 Not Supported

**Category:** Broken ATO/RMF Workflow | **Priority:** Medium
**Regulation:** SP 800-37 Task I-2

### Observation
The control inheritance sub-page renders blank. There is no workflow to document or formally accept Common Control Provider (CCP) inheritance. SP 800-37 Task I-2 requires inherited controls be formally identified and accepted.

### Evidence
- Issue #634 — control inheritance sub-page renders blank (one of 11 blank sub-pages)

### Impact
Systems cannot formally document which controls are inherited from CCPs. SSP exports will be incomplete and do not satisfy SP 800-37 Task I-2 requirements.

### Acceptance Criteria
- [ ] Control inheritance sub-page renders content
- [ ] Workflow to identify controls as inherited from a named CCP
- [ ] Formal acceptance action with responsible party and timestamp
- [ ] Inherited controls reflected correctly in SSP export