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/cli/duration_test.go

@@ -1,20 +1,47 @@
-package cli
+package cli //nolint:testpackage // needs access to unexported parseDuration
 
 import (
 	"testing"
 	"time"
 
 	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
 )
 
-func TestParseDuration(t *testing.T) {
-	tests := []struct {
-		name     string
-		input    string
-		expected time.Duration
-		wantErr  bool
-	}{
-		// Standard Go durations
+type parseDurationCase struct {
+	name     string
+	input    string
+	expected time.Duration
+	wantErr  bool
+}
+
+// runParseDurationCases executes a table of parseDuration cases as
+// parallel subtests.
+func runParseDurationCases(t *testing.T, tests []parseDurationCase) {
+	t.Helper()
+
+	for _, tt := range tests {
+		t.Run(tt.name, func(t *testing.T) {
+			t.Parallel()
+
+			got, err := parseDuration(tt.input)
+
+			if tt.wantErr {
+				require.Error(t, err, "expected error for input %q", tt.input)
+
+				return
+			}
+
+			require.NoError(t, err, "unexpected error for input %q", tt.input)
+			assert.Equal(t, tt.expected, got, "duration mismatch for input %q", tt.input)
+		})
+	}
+}
+
+func TestParseDurationStandard(t *testing.T) {
+	t.Parallel()
+
+	runParseDurationCases(t, []parseDurationCase{
 		{
 			name:     "standard seconds",
 			input:    "30s",
@@ -45,6 +72,13 @@ func TestParseDuration(t *testing.T) {
 			input:    "1s500ms",
 			expected: 1*time.Second + 500*time.Millisecond,
 		},
+	})
+}
+
+func TestParseDurationExtendedUnits(t *testing.T) {
+	t.Parallel()
+
+	runParseDurationCases(t, []parseDurationCase{
 		// Extended units - days
 		{
 			name:     "single day",
@@ -114,6 +148,13 @@ func TestParseDuration(t *testing.T) {
 			input:    "1year",
 			expected: 365 * 24 * time.Hour,
 		},
+	})
+}
+
+func TestParseDurationCombinedAndErrors(t *testing.T) {
+	t.Parallel()
+
+	runParseDurationCases(t, []parseDurationCase{
 		// Combined extended units
 		{
 			name:     "weeks and days",
@@ -131,9 +172,11 @@ func TestParseDuration(t *testing.T) {
 			expected: 24*time.Hour + 12*time.Hour,
 		},
 		{
-			name:     "complex combination",
-			input:    "1y2mo3w4d5h6m7s",
-			expected: 365*24*time.Hour + 2*30*24*time.Hour + 3*7*24*time.Hour + 4*24*time.Hour + 5*time.Hour + 6*time.Minute + 7*time.Second,
+			name:  "complex combination",
+			input: "1y2mo3w4d5h6m7s",
+			expected: 365*24*time.Hour + 2*30*24*time.Hour +
+				3*7*24*time.Hour + 4*24*time.Hour +
+				5*time.Hour + 6*time.Minute + 7*time.Second,
 		},
 		{
 			name:     "with spaces",
@@ -177,25 +220,12 @@ func TestParseDuration(t *testing.T) {
 			input:   "-5d",
 			wantErr: true,
 		},
-	}
-
-	for _, tt := range tests {
-		t.Run(tt.name, func(t *testing.T) {
-			got, err := parseDuration(tt.input)
-
-			if tt.wantErr {
-				assert.Error(t, err, "expected error for input %q", tt.input)
-
-				return
-			}
-
-			assert.NoError(t, err, "unexpected error for input %q", tt.input)
-			assert.Equal(t, tt.expected, got, "duration mismatch for input %q", tt.input)
-		})
-	}
+	})
 }
 
 func TestParseDurationSpecialCases(t *testing.T) {
+	t.Parallel()
+
 	// Test that standard Go durations work exactly as expected
 	standardDurations := []string{
 		"300ms",
@@ -209,15 +239,17 @@ func TestParseDurationSpecialCases(t *testing.T) {
 
 	for _, d := range standardDurations {
 		expected, err := time.ParseDuration(d)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 
 		got, err := parseDuration(d)
-		assert.NoError(t, err)
+		require.NoError(t, err)
 		assert.Equal(t, expected, got, "standard duration %q should parse identically", d)
 	}
 }
 
 func TestParseDurationRealWorldExamples(t *testing.T) {
+	t.Parallel()
+
 	// Test real-world snapshot purge scenarios
 	tests := []struct {
 		description string
@@ -253,12 +285,15 @@ func TestParseDurationRealWorldExamples(t *testing.T) {
 
 	for _, tt := range tests {
 		t.Run(tt.description, func(t *testing.T) {
+			t.Parallel()
+
 			got, err := parseDuration(tt.input)
-			assert.NoError(t, err)
+			require.NoError(t, err)
 			assert.Equal(t, tt.olderThan, got)
 
 			// Verify the duration makes sense for snapshot purging
-			assert.Greater(t, got, time.Hour, "snapshot purge duration should be at least an hour")
+			assert.Greater(t, got, time.Hour,
+				"snapshot purge duration should be at least an hour")
 		})
 	}
 }