diff --git a/pkg/context/safe_log_test.go b/pkg/context/safe_log_test.go
index c6b2bf4..556bfc7 100644
--- a/pkg/context/safe_log_test.go
+++ b/pkg/context/safe_log_test.go
@@ -12,11 +12,13 @@ import (
 // entries. A newline lets an attacker append a fabricated line; a carriage
 // return can overwrite one on a terminal; ANSI escapes can hide text entirely.
 func TestSafeLogValueStripsControlCharacters(t *testing.T) {
-	tests := []struct {
+	type testCase struct {
 		name  string
 		input string
 		want  string
-	}{
+	}
+
+	tests := []testCase{
 		{"plain text passes through", "111111111111", "111111111111"},
 		{"newline forging a second entry", "111\nlevel=fatal msg=\"breach\"", "111level=fatal msg=\"breach\""},
 		{"carriage return overwriting a line", "111\rmalicious", "111malicious"},
@@ -26,16 +28,19 @@ func TestSafeLogValueStripsControlCharacters(t *testing.T) {
 		{"delete character", "111\x7f222", "111222"},
 		{"empty stays empty", "", ""},
 		{"unicode is preserved", "café-eu-west-1", "café-eu-west-1"},
-
-		// Filtering only the ASCII range leaves these, and each breaks a log
-		// line as effectively as \n does.
-		{"U+2028 line separator", "111
forged", "111forged"},
-		{"U+2029 paragraph separator", "111
forged", "111forged"},
-		{"U+0085 next line", "111…forged", "111forged"},
-		{"U+009B C1 control sequence introducer", "111›forged", "111forged"},
-		{"U+200E bidi mark reordering display", "111‎forged", "111forged"},
-		{"U+202E right-to-left override", "111‮forged", "111forged"},
-		{"U+200B zero-width space", "111​forged", "111forged"},
+	}
+	// Filtering only the ASCII range leaves these, and each breaks a log line
+	// as effectively as \n does.
+	for name, r := range map[string]rune{
+		"U+2028 line separator":                 0x2028,
+		"U+2029 paragraph separator":            0x2029,
+		"U+0085 next line":                      0x0085,
+		"U+009B C1 control sequence introducer": 0x009B,
+		"U+200E bidi mark reordering display":   0x200E,
+		"U+202E right-to-left override":         0x202E,
+		"U+200B zero-width space":               0x200B,
+	} {
+		tests = append(tests, testCase{name, "111" + string(r) + "forged", "111forged"})
 	}
 
 	for _, tc := range tests {
diff --git a/pkg/diff/diff.go b/pkg/diff/diff.go
index 2be0cf4..f6a9954 100644
--- a/pkg/diff/diff.go
+++ b/pkg/diff/diff.go
@@ -354,6 +354,15 @@ func formatJSON(diff *PipelineDiff) string {
 	return string(data)
 }
 
+func writeChangeSummary(sb *strings.Builder, summary ChangeSummary) {
+	fmt.Fprintf(sb, "  Added:     %d\n", summary.Added)
+	fmt.Fprintf(sb, "  Removed:   %d\n", summary.Removed)
+	fmt.Fprintf(sb, "  Modified:  %d\n", summary.Modified)
+	fmt.Fprintf(sb, "  Unchanged: %d\n", summary.Unchanged)
+	fmt.Fprintf(sb, "  Total:     %d\n", summary.Total)
+	sb.WriteString("\n")
+}
+
 func formatHuman(diff *PipelineDiff) string {
 	var sb strings.Builder
 
@@ -365,12 +374,7 @@ func formatHuman(diff *PipelineDiff) string {
 	// Overall summary
 	sb.WriteString("Pipeline Diff Summary\n")
 	sb.WriteString("=====================\n")
-	sb.WriteString(fmt.Sprintf("  Added:     %d\n", diff.Summary.Added))
-	sb.WriteString(fmt.Sprintf("  Removed:   %d\n", diff.Summary.Removed))
-	sb.WriteString(fmt.Sprintf("  Modified:  %d\n", diff.Summary.Modified))
-	sb.WriteString(fmt.Sprintf("  Unchanged: %d\n", diff.Summary.Unchanged))
-	sb.WriteString(fmt.Sprintf("  Total:     %d\n", diff.Summary.Total))
-	sb.WriteString("\n")
+	writeChangeSummary(&sb, diff.Summary)
 
 	if diff.IsZeroSum() {
 		sb.WriteString("✅ ZERO-SUM: No changes detected\n")
@@ -385,7 +389,7 @@ func formatHuman(diff *PipelineDiff) string {
 			continue
 		}
 
-		sb.WriteString(fmt.Sprintf("Target: %s\n", td.Target))
+		fmt.Fprintf(&sb, "Target: %s\n", td.Target)
 		sb.WriteString(strings.Repeat("-", 40) + "\n")
 
 		for _, c := range td.Changes {
@@ -399,16 +403,16 @@ func formatHuman(diff *PipelineDiff) string {
 				if c.DesiredVersion > 0 {
 					versionInfo = fmt.Sprintf(" (v%d)", c.DesiredVersion)
 				}
-				sb.WriteString(fmt.Sprintf("  + %s (new secret)%s\n", c.Path, versionInfo))
+				fmt.Fprintf(&sb, "  + %s (new secret)%s\n", c.Path, versionInfo)
 				if len(c.DesiredKeys) > 0 {
-					sb.WriteString(fmt.Sprintf("    keys: %v\n", c.DesiredKeys))
+					fmt.Fprintf(&sb, "    keys: %v\n", c.DesiredKeys)
 				}
 			case ChangeTypeRemoved:
 				versionInfo := ""
 				if c.CurrentVersion > 0 {
 					versionInfo = fmt.Sprintf(" (was v%d)", c.CurrentVersion)
 				}
-				sb.WriteString(fmt.Sprintf("  - %s (removed)%s\n", c.Path, versionInfo))
+				fmt.Fprintf(&sb, "  - %s (removed)%s\n", c.Path, versionInfo)
 			case ChangeTypeModified:
 				versionInfo := ""
 				if c.CurrentVersion > 0 && c.DesiredVersion > 0 {
@@ -418,15 +422,15 @@ func formatHuman(diff *PipelineDiff) string {
 				} else if c.DesiredVersion > 0 {
 					versionInfo = fmt.Sprintf(" (→ v%d)", c.DesiredVersion)
 				}
-				sb.WriteString(fmt.Sprintf("  ~ %s (modified)%s\n", c.Path, versionInfo))
+				fmt.Fprintf(&sb, "  ~ %s (modified)%s\n", c.Path, versionInfo)
 				if len(c.KeysAdded) > 0 {
-					sb.WriteString(fmt.Sprintf("    + keys: %v\n", c.KeysAdded))
+					fmt.Fprintf(&sb, "    + keys: %v\n", c.KeysAdded)
 				}
 				if len(c.KeysRemoved) > 0 {
-					sb.WriteString(fmt.Sprintf("    - keys: %v\n", c.KeysRemoved))
+					fmt.Fprintf(&sb, "    - keys: %v\n", c.KeysRemoved)
 				}
 				if len(c.KeysModified) > 0 {
-					sb.WriteString(fmt.Sprintf("    ~ keys: %v\n", c.KeysModified))
+					fmt.Fprintf(&sb, "    ~ keys: %v\n", c.KeysModified)
 				}
 			}
 		}
@@ -442,9 +446,9 @@ func formatGitHub(diff *PipelineDiff) string {
 	if diff.IsZeroSum() {
 		sb.WriteString("::notice::✅ Zero-sum: No changes detected\n")
 	} else {
-		sb.WriteString(fmt.Sprintf("::warning::⚠️ %d changes detected (%d added, %d removed, %d modified)\n",
+		fmt.Fprintf(&sb, "::warning::⚠️ %d changes detected (%d added, %d removed, %d modified)\n",
 			diff.Summary.Added+diff.Summary.Removed+diff.Summary.Modified,
-			diff.Summary.Added, diff.Summary.Removed, diff.Summary.Modified))
+			diff.Summary.Added, diff.Summary.Removed, diff.Summary.Modified)
 	}
 
 	// Group annotations by target
@@ -453,18 +457,18 @@ func formatGitHub(diff *PipelineDiff) string {
 			continue
 		}
 
-		sb.WriteString(fmt.Sprintf("::group::Target: %s (%d changes)\n", escapeGitHubCommandData(td.Target),
-			td.Summary.Added+td.Summary.Removed+td.Summary.Modified))
+		fmt.Fprintf(&sb, "::group::Target: %s (%d changes)\n", escapeGitHubCommandData(td.Target),
+			td.Summary.Added+td.Summary.Removed+td.Summary.Modified)
 
 		for _, c := range td.Changes {
 			safePath := escapeGitHubCommandData(c.Path)
 			switch c.ChangeType {
 			case ChangeTypeAdded:
-				sb.WriteString(fmt.Sprintf("::notice::+ %s (new secret)\n", safePath))
+				fmt.Fprintf(&sb, "::notice::+ %s (new secret)\n", safePath)
 			case ChangeTypeRemoved:
-				sb.WriteString(fmt.Sprintf("::warning::- %s (removed)\n", safePath))
+				fmt.Fprintf(&sb, "::warning::- %s (removed)\n", safePath)
 			case ChangeTypeModified:
-				sb.WriteString(fmt.Sprintf("::notice::~ %s (modified)\n", safePath))
+				fmt.Fprintf(&sb, "::notice::~ %s (modified)\n", safePath)
 			}
 		}
 
@@ -530,12 +534,7 @@ func formatSideBySide(diff *PipelineDiff, showValues bool) string {
 	// Overall summary
 	sb.WriteString("Pipeline Diff Summary (Side-by-Side)\n")
 	sb.WriteString("====================================\n")
-	sb.WriteString(fmt.Sprintf("  Added:     %d\n", diff.Summary.Added))
-	sb.WriteString(fmt.Sprintf("  Removed:   %d\n", diff.Summary.Removed))
-	sb.WriteString(fmt.Sprintf("  Modified:  %d\n", diff.Summary.Modified))
-	sb.WriteString(fmt.Sprintf("  Unchanged: %d\n", diff.Summary.Unchanged))
-	sb.WriteString(fmt.Sprintf("  Total:     %d\n", diff.Summary.Total))
-	sb.WriteString("\n")
+	writeChangeSummary(&sb, diff.Summary)
 
 	if diff.IsZeroSum() {
 		sb.WriteString("✅ ZERO-SUM: No changes detected\n")
@@ -550,7 +549,7 @@ func formatSideBySide(diff *PipelineDiff, showValues bool) string {
 			continue
 		}
 
-		sb.WriteString(fmt.Sprintf("Target: %s\n", td.Target))
+		fmt.Fprintf(&sb, "Target: %s\n", td.Target)
 		sb.WriteString(strings.Repeat("=", 80) + "\n")
 
 		for _, c := range td.Changes {
@@ -583,33 +582,33 @@ func formatSecretChangeSideBySide(change SecretChange, showValues bool) string {
 
 	switch change.ChangeType {
 	case ChangeTypeAdded:
-		sb.WriteString(fmt.Sprintf("+ %s%s\n", change.Path, versionInfo))
+		fmt.Fprintf(&sb, "+ %s%s\n", change.Path, versionInfo)
 		sb.WriteString("  ┌─ NEW SECRET ─────────────────────────────────────────────────────────┐\n")
 		if showValues && change.DesiredValues != nil {
 			for key, value := range change.DesiredValues {
 				maskedValue := maskValue(value, showValues)
-				sb.WriteString(fmt.Sprintf("  │ + %-20s: %s\n", key, maskedValue))
+				fmt.Fprintf(&sb, "  │ + %-20s: %s\n", key, maskedValue)
 			}
 		} else if len(change.DesiredKeys) > 0 {
-			sb.WriteString(fmt.Sprintf("  │   Keys: %v\n", change.DesiredKeys))
+			fmt.Fprintf(&sb, "  │   Keys: %v\n", change.DesiredKeys)
 		}
 		sb.WriteString("  └──────────────────────────────────────────────────────────────────────┘\n")
 
 	case ChangeTypeRemoved:
-		sb.WriteString(fmt.Sprintf("- %s%s\n", change.Path, versionInfo))
+		fmt.Fprintf(&sb, "- %s%s\n", change.Path, versionInfo)
 		sb.WriteString("  ┌─ REMOVED SECRET ─────────────────────────────────────────────────────┐\n")
 		if showValues && change.CurrentValues != nil {
 			for key, value := range change.CurrentValues {
 				maskedValue := maskValue(value, showValues)
-				sb.WriteString(fmt.Sprintf("  │ - %-20s: %s\n", key, maskedValue))
+				fmt.Fprintf(&sb, "  │ - %-20s: %s\n", key, maskedValue)
 			}
 		} else if len(change.CurrentKeys) > 0 {
-			sb.WriteString(fmt.Sprintf("  │   Keys: %v\n", change.CurrentKeys))
+			fmt.Fprintf(&sb, "  │   Keys: %v\n", change.CurrentKeys)
 		}
 		sb.WriteString("  └──────────────────────────────────────────────────────────────────────┘\n")
 
 	case ChangeTypeModified:
-		sb.WriteString(fmt.Sprintf("~ %s%s\n", change.Path, versionInfo))
+		fmt.Fprintf(&sb, "~ %s%s\n", change.Path, versionInfo)
 		sb.WriteString("  ┌─ CURRENT ─────────────────┬─ DESIRED ─────────────────────────────────┐\n")
 
 		// Show side-by-side comparison
@@ -648,23 +647,23 @@ func formatSecretChangeSideBySide(change SecretChange, showValues bool) string {
 					indicator = "~"
 				}
 
-				sb.WriteString(fmt.Sprintf("  │%s%-10s: %-15s │%s%-10s: %-15s │\n",
+				fmt.Fprintf(&sb, "  │%s%-10s: %-15s │%s%-10s: %-15s │\n",
 					indicator, key, truncateString(currentStr, 15),
-					indicator, key, truncateString(desiredStr, 15)))
+					indicator, key, truncateString(desiredStr, 15))
 			}
 		} else {
 			// Show key-level changes
 			if len(change.KeysAdded) > 0 {
-				sb.WriteString(fmt.Sprintf("  │ + Added keys: %-12s │                                           │\n",
-					strings.Join(change.KeysAdded, ", ")))
+				fmt.Fprintf(&sb, "  │ + Added keys: %-12s │                                           │\n",
+					strings.Join(change.KeysAdded, ", "))
 			}
 			if len(change.KeysRemoved) > 0 {
-				sb.WriteString(fmt.Sprintf("  │ - Removed keys: %-10s │                                           │\n",
-					strings.Join(change.KeysRemoved, ", ")))
+				fmt.Fprintf(&sb, "  │ - Removed keys: %-10s │                                           │\n",
+					strings.Join(change.KeysRemoved, ", "))
 			}
 			if len(change.KeysModified) > 0 {
-				sb.WriteString(fmt.Sprintf("  │ ~ Modified keys: %-9s │                                           │\n",
-					strings.Join(change.KeysModified, ", ")))
+				fmt.Fprintf(&sb, "  │ ~ Modified keys: %-9s │                                           │\n",
+					strings.Join(change.KeysModified, ", "))
 			}
 		}
 		sb.WriteString("  └───────────────────────────┴───────────────────────────────────────────┘\n")
diff --git a/pkg/observability/tracing.go b/pkg/observability/tracing.go
index 56e2b05..80a840f 100644
--- a/pkg/observability/tracing.go
+++ b/pkg/observability/tracing.go
@@ -10,6 +10,8 @@ import (
 	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracegrpc"
 	"go.opentelemetry.io/otel/exporters/otlp/otlptrace/otlptracehttp"
 	"go.opentelemetry.io/otel/exporters/stdout/stdouttrace"
+
+	//nolint:staticcheck // Zipkin remains a documented, supported compatibility exporter.
 	"go.opentelemetry.io/otel/exporters/zipkin"
 	"go.opentelemetry.io/otel/propagation"
 	"go.opentelemetry.io/otel/sdk/resource"
diff --git a/pkg/pipeline/aws_context.go b/pkg/pipeline/aws_context.go
index e98006e..420d109 100644
--- a/pkg/pipeline/aws_context.go
+++ b/pkg/pipeline/aws_context.go
@@ -641,30 +641,30 @@ func (ec *AWSExecutionContext) Summary() string {
 	var sb strings.Builder
 
 	sb.WriteString("AWS Execution Context:\n")
-	sb.WriteString(fmt.Sprintf("  Account ID: %s\n", ec.CallerIdentity.AccountID))
-	sb.WriteString(fmt.Sprintf("  ARN: %s\n", ec.CallerIdentity.ARN))
+	fmt.Fprintf(&sb, "  Account ID: %s\n", ec.CallerIdentity.AccountID)
+	fmt.Fprintf(&sb, "  ARN: %s\n", ec.CallerIdentity.ARN)
 
 	if ec.OrganizationInfo != nil {
-		sb.WriteString(fmt.Sprintf("  Organization ID: %s\n", ec.OrganizationInfo.ID))
-		sb.WriteString(fmt.Sprintf("  Management Account: %s\n", ec.OrganizationInfo.MasterAccountID))
+		fmt.Fprintf(&sb, "  Organization ID: %s\n", ec.OrganizationInfo.ID)
+		fmt.Fprintf(&sb, "  Management Account: %s\n", ec.OrganizationInfo.MasterAccountID)
 
 		if ec.OrganizationInfo.IsManagementAccount {
 			sb.WriteString("  Role: Management Account ⚠️\n")
 		} else if ec.OrganizationInfo.IsDelegatedAdmin {
 			sb.WriteString("  Role: Delegated Administrator ✓\n")
-			sb.WriteString(fmt.Sprintf("  Delegated Services: %v\n", ec.OrganizationInfo.DelegatedServices))
+			fmt.Fprintf(&sb, "  Delegated Services: %v\n", ec.OrganizationInfo.DelegatedServices)
 		} else {
 			sb.WriteString("  Role: Member Account\n")
 		}
 	}
 
-	sb.WriteString(fmt.Sprintf("  Control Tower: %v\n", ec.Config.ControlTower.Enabled))
+	fmt.Fprintf(&sb, "  Control Tower: %v\n", ec.Config.ControlTower.Enabled)
 	if ec.Config.ControlTower.Enabled {
-		sb.WriteString(fmt.Sprintf("  Execution Role: %s\n", ec.Config.ControlTower.ExecutionRole.Name))
+		fmt.Fprintf(&sb, "  Execution Role: %s\n", ec.Config.ControlTower.ExecutionRole.Name)
 	}
 
-	sb.WriteString(fmt.Sprintf("  Identity Center Access: %v\n", ec.CanAccessIdentityCenter()))
-	sb.WriteString(fmt.Sprintf("  Organizations Access: %v\n", ec.CanAccessOrganizations()))
+	fmt.Fprintf(&sb, "  Identity Center Access: %v\n", ec.CanAccessIdentityCenter())
+	fmt.Fprintf(&sb, "  Organizations Access: %v\n", ec.CanAccessOrganizations())
 
 	return sb.String()
 }
diff --git a/pkg/pipeline/graph.go b/pkg/pipeline/graph.go
index 852d386..dc0e4e8 100644
--- a/pkg/pipeline/graph.go
+++ b/pkg/pipeline/graph.go
@@ -242,7 +242,7 @@ func (g *Graph) PrintGraph() string {
 	sb.WriteString("Dependency Graph:\n")
 
 	for i, level := range levels {
-		sb.WriteString(fmt.Sprintf("  Level %d: %v\n", i, level))
+		fmt.Fprintf(&sb, "  Level %d: %v\n", i, level)
 	}
 
 	sb.WriteString("\nInheritance:\n")
@@ -257,7 +257,7 @@ func (g *Graph) PrintGraph() string {
 				}
 			}
 			if len(targetDeps) > 0 {
-				sb.WriteString(fmt.Sprintf("  %s <- %v\n", name, targetDeps))
+				fmt.Fprintf(&sb, "  %s <- %v\n", name, targetDeps)
 			}
 		}
 	}
diff --git a/pkg/pipeline/pipeline.go b/pkg/pipeline/pipeline.go
index 275ddda..adb333f 100644
--- a/pkg/pipeline/pipeline.go
+++ b/pkg/pipeline/pipeline.go
@@ -182,9 +182,9 @@ func NewWithContextAndRuntimeAuth(ctx context.Context, cfg *Config, auth *Runtim
 
 	// Initialize AWS execution context if configured
 	if runtimeCfg.AWS.ExecutionContext.Type != "" {
-		awsCtx, err := NewAWSExecutionContextWithRuntimeAuth(ctx, &runtimeCfg.AWS, p.runtimeAWSAuth())
-		if err != nil {
-			log.WithError(err).Warn("Failed to initialize AWS execution context")
+		awsCtx, awsErr := NewAWSExecutionContextWithRuntimeAuth(ctx, &runtimeCfg.AWS, p.runtimeAWSAuth())
+		if awsErr != nil {
+			log.WithError(awsErr).Warn("Failed to initialize AWS execution context")
 		} else {
 			p.awsCtx = awsCtx
 		}
@@ -194,15 +194,15 @@ func NewWithContextAndRuntimeAuth(ctx context.Context, cfg *Config, auth *Runtim
 	// exists. Validate accepts a config whose targets are entirely dynamic, so
 	// skipping this would build an empty dependency graph and the run would
 	// report success having synced nothing.
-	if err := p.expandDynamicTargets(ctx, runtimeCfg); err != nil {
-		return nil, err
+	if expandErr := p.expandDynamicTargets(ctx, runtimeCfg); expandErr != nil {
+		return nil, expandErr
 	}
 
 	// Initialize S3 merge store if configured
 	if runtimeCfg.MergeStore.S3 != nil {
-		s3Store, err := NewS3MergeStoreWithRuntimeAuth(ctx, runtimeCfg.MergeStore.S3, runtimeCfg.AWS.Region, p.runtimeAWSAuth())
-		if err != nil {
-			log.WithError(err).Warn("Failed to initialize S3 merge store")
+		s3Store, s3Err := NewS3MergeStoreWithRuntimeAuth(ctx, runtimeCfg.MergeStore.S3, runtimeCfg.AWS.Region, p.runtimeAWSAuth())
+		if s3Err != nil {
+			log.WithError(s3Err).Warn("Failed to initialize S3 merge store")
 		} else {
 			p.s3Store = s3Store
 			// Build cross-region replicas if configured.
diff --git a/scripts/go-packages.sh b/scripts/go-packages.sh
index 210247a..a1d9817 100755
--- a/scripts/go-packages.sh
+++ b/scripts/go-packages.sh
@@ -9,6 +9,8 @@ mapfile -t package_dirs < <(
     ! -path './.tools/*' \
     ! -path './bin/*' \
     ! -path './dist/*' \
+    ! -path '*/node_modules/*' \
+    ! -path './docs/dist/*' \
     ! -path './python/build/*' \
     -exec dirname {} \; \
     | sort -u