Tool Improvements

• feat: add support for diffing existing scan results by @egibs in #1274
• chore: migrate from urfave/cli/v2 to urfave/cli/v3 by @egibs in #1278

Rule Improvements

• Update third-party rules as of 2025-12-15 by @octo-sts[bot] in #1269
• Update third-party rules as of 2025-12-16 by @octo-sts[bot] in #1272
• Update third-party rules as of 2025-12-22 by @octo-sts[bot] in #1277
• chore: 2025-12-23 false positive reduction by @egibs in #1279

Developer Improvements

• chore: add a Makefile target for go get -u; run it by @egibs in #1275

Full Changelog: v1.18.3...v1.19.0