feat: enrich findings with EPSS scores from FIRST.org - #1053
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New src/epss/client.ts: fetchEpssScores() batch-fetches EPSS scores from the FIRST.org API (https://api.first.org/data/v1/epss) for a list of CVE IDs. Returns a Map<string, EpssScore> keyed by uppercase CVE ID. Degrades gracefully (returns empty Map) on any network/parse failure. Filters out non-CVE IDs (GHSA-only findings) before calling the API. Added EpssScore type to src/types.ts and the optional epssScores field to Finding so the scanner can attach per-finding EPSS data. 11 unit tests in tests/epss.test.ts cover: empty input, GHSA-only filtering, correct parse, uppercase normalization, deduplication, non-200 status, network throws, malformed JSON, malformed epss values, and missing data array.
scanner.ts: after the OSV + remediation pass, call enrichWithEpssScores() to batch-fetch FIRST.org EPSS data for all CVE IDs in one HTTP request. Skipped in offline mode and when no CVE aliases are present. Failures degrade silently (empty map, no scan error). formatters.ts: serializeFinding() now includes epssScores (array or null) so the JSON output and HTML report data both carry EPSS automatically. printers.ts: verbose compact block shows the highest-EPSS score per finding, e.g. "EPSS: 97.6% exploitation probability - CVE-2021-44228 (top 0.03% of all CVEs)". html-reporter.ts: finding detail panel includes a new EPSS subheading with the same highest-score display when scores are available. The tooltip explains what EPSS measures.
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Adds EPSS (Exploit Prediction Scoring System) enrichment from FIRST.org to all findings. After the OSV pass, CVE aliases are batch-fetched in a single API call and each finding gets an
epssScoresarray with probability and percentile values.epssScoresarray per findingCloses #1052