Remediate all lint findings under the canonical golangci-lint config

Fix every finding surfaced by the canonical .golangci.yml with
golangci-lint v2.12.2 (refs #61), behavior-preserving throughout:

- err113: dynamic errors replaced with package-level sentinels and %w
  wrapping; direct comparisons converted to errors.Is
- goprintffuncname: printf-style helpers renamed with an f suffix
  (ui.Writer message methods, cli.ReportErrorf, database.Fatalf,
  vaultik stdoutf) and all call sites updated
- revive: stuttering type names renamed (blob.Handler, blob.WithReader,
  blob.ChunkPosition, storage.URL, storage.Info), doc comments added,
  unused parameters blanked, package comments added
- contextcheck/noctx: ctx threaded through blob.Packer
  (AddChunk/Flush/FinalizeBlob/PackChunks) and scanner call sites;
  context-aware exec and sql variants used
- funlen/cyclop/gocognit/nestif/dupl: oversized or duplicated
  functions split into focused helpers across production and test code
- paralleltest/tparallel/thelper/usetesting/testpackage: tests
  parallelized where safe (global log.Initialize kept in the serial
  phase), helpers marked, t.TempDir adopted, external test packages
  where only exported API is used
- gosec: integer conversions clamped or justified, header timeouts
  added, remaining findings suppressed with per-site justifications
- mnd/goconst/lll/wsl_v5/nlreturn/noinlineerr/errcheck and other
  mechanical findings fixed directly

Remove the deprecated log.LogOptions alias (callers migrated to
log.Options). make check is green.

internal/storage/s3.go

@@ -24,7 +24,10 @@ func (s *S3Storer) Put(ctx context.Context, key string, data io.Reader) error {
 }
 
 // PutWithProgress stores data with progress reporting.
-func (s *S3Storer) PutWithProgress(ctx context.Context, key string, data io.Reader, size int64, progress ProgressCallback) error {
+func (s *S3Storer) PutWithProgress(
+	ctx context.Context, key string, data io.Reader,
+	size int64, progress ProgressCallback,
+) error {
 	// Convert storage.ProgressCallback to s3.ProgressCallback
 	var s3Progress s3.ProgressCallback
 	if progress != nil {
@@ -81,8 +84,8 @@ func (s *S3Storer) ListStream(ctx context.Context, prefix string) <-chan ObjectI
 }
 
 // Info returns human-readable storage location information.
-func (s *S3Storer) Info() StorageInfo {
-	return StorageInfo{
+func (s *S3Storer) Info() Info {
+	return Info{
 		Type:     "s3",
 		Location: fmt.Sprintf("%s/%s", s.client.Endpoint(), s.client.BucketName()),
 	}