Gaps & Debt

From Stage 4 Gap-Fill Review: - Resolved: All implementation source files mapped via T6 (implementation source) and T7 (testing) indexes - Resolved: Error handling coverage complete across all 9 core modules with dedicated tests - Resolved: Deprecated build_cdi.sh and duplicate src/main.c removed per P0 mandate - Resolved: CHANGELOG.md properly indexed in T1 (Project Docs & PRD) - No Critical Gaps: All specification documents have corresponding implementation coverage - Technical Debt: Consider consolidating documentation to reduce redundancy between README.md, docs/, and stage-briefs/