fix: CVE correctness — severity, ecosystems, caching (audit H2/H3/M3) - #48
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…H2/H3/M3) - H3: severity is computed locally from OSV's own CVSS vector (cvss3_base_score, full v3.1 formula) instead of being discarded. A 9.8 CRITICAL advisory no longer collapses to INFO when NVD is unavailable. NVD is now a fallback only, so classification is deterministic and offline-safe. - H2: add go.mod (Go) and package-lock.json (npm) parsers — those ecosystems got ZERO CVE coverage while the (now-removed) ECOSYSTEMS dict falsely advertised them. .csproj now handles reversed-attr and child-element forms. Verified live: gin 1.6.0 + axios 0.21.0 return 28 real advisories. - M3: don't cache a hollow record when a per-vuln detail fetch fails (was poisoning the 24h cache with INFO); a total OSV failure now warns on stderr instead of silently reading as 'no advisories'. Tests: cvss3_base_score (9.8/5.3/invalid), multi-ecosystem parse incl. go.mod/ package-lock/awkward csproj, langchain live test still green. 23 passed.
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Fixes three CVE-pipeline audit findings.
ECOSYSTEMSdict;.csprojhandles reversed-attr + child-element forms. Verified live: gin 1.6.0 + axios 0.21.0 → 28 advisories.23 tests pass (added CVSS + extended ecosystem tests); langchain live test green.