Codex/review 1

[Neo23x0]

Summary

• escape rule meta values (description, author, reference) in rule generation to prevent malformed YARA when inputs contain quotes/backslashes/newlines
• harden scoring rule import to avoid duplicate non-builtin entries by updating existing matching rules on re-import
• emit a warning when a regex scoring rule cannot be compiled during engine reload
• avoid panic risk in yargen-util merge by handling inspect failures after merge
• add targeted tests for metadata escaping, import dedupe/update behavior, and invalid-regex warning behavior

Notes

• this branch also removes two test files from an earlier branch iteration: internal/filter/strings_test.go and internal/web/handlers_test.go

Validation

• go test ./...
• go vet ./...