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

.golangci.yml

@@ -95,5 +95,10 @@ issues:
       linters:
         - lll
 
+    # Exclude unused parameter warnings for cobra command signatures
+    - text: "parameter '(args|cmd)' seems to be unused"
+      linters:
+        - revive
+
   max-issues-per-linter: 0
   max-same-issues: 0