Validate unmapped segment file ranges without adding virtual mappings or fallback metadata addresses. Keep mapped-segment bounds and reject build-info sections declared in unmapped segments.
Validation: real unstripped Go 1.26.5 Darwin arm64 and amd64 artifacts passed CLI/MCP oracle, Evidence, source-range and unchanged-byte checks. Retained malformed-input regressions; removed the weaker synthetic acceptance test. Full cross-platform verifier not run. Fixes#2167.