Fix intrange and G101 linting issues

- Convert for loops to use Go 1.22+ integer ranges in generate.go and helpers.go
- Disable G101 false positives for test vectors and environment variable names
- Add file-level gosec disable for bip85_test.go containing BIP85 test vectors
- Add targeted nolint comments for legitimate test data and constants

cmd/secret/main.go

@@ -3,5 +3,5 @@ package main
 import "git.eeqj.de/sneak/secret/internal/cli"
 
 func main() {
-	cli.CLIEntry()
+	cli.Entry()
 }