first pass IAF content
New content: website/docs/business-case/ImpactAssessmentFramework.md
- Replaced 13-line skeleton with complete framework (~150 lines)
- Defines OECD-style results chain: Inputs → Outputs → Outcomes → Impacts
- Output metric tables for all 5 implementer types (Industry, Software, Conformity Schemes, Regulators, Identity Registers)
- Three-tier aggregation model (implementer → community → global) with anonymisation at each boundary
- SDG target mapping table linking 6 outcome categories to targets 6.3, 8.7, 12.5, 12.6, 13.2, 15.2
- 6-monthly reporting process integrated into existing implementation registration workflow
- Closes the loop back to industry/government business cases and CAP
Cross-reference fix: website/docs/implementations/index.md
- "annual" → "6-monthly" reporting frequency
- "Value Assessment Framework" → "Impact Assessment Framework" link text