chore: clear actionable SonarCloud smells (shell [[, merged if)

- Scripts/audit-a11y.sh: replace `[ ... ]` with `[[ ... ]]` in the seven
  shell conditionals SonarCloud flagged (shelldre:S7688). The script is bash
  (`#!/usr/bin/env bash`), so `[[` is safe and avoids word-splitting/globbing
  footguns. The jq `[ .devices | ... ]` filter is untouched — it is not a
  shell test.
- AccessibilityAuditHarness.swift: fold the nested `if` in the noise
  classifier into a single conditional (swift:S1066); behavior unchanged.

The remaining open SonarCloud issues (S1075 https literals, S115 external-JSON
CodingKeys, S107 parameter counts, S3087 callback nesting) are false positives
or intentional and are being resolved as Won't Fix / Safe in SonarCloud,
consistent with the v4.8.3 static-analysis policy in RELEASE_ROADMAP.md.

2 files changed, 10 insertions, 10 deletions

diff --git a/DomainDigUITests/AccessibilityAuditHarness.swift b/DomainDigUITests/AccessibilityAuditHarness.swift
index 24f900e..58583e1 100644
--- a/DomainDigUITests/AccessibilityAuditHarness.swift
+++ b/DomainDigUITests/AccessibilityAuditHarness.swift
@@ -184,10 +184,10 @@ enum AccessibilityAuditHarness {
         // and the search field's hit region at accessibility sizes is the
         // system's own control. Reading `elementType` here is safe; reading
         // `frame` is not (it kills element attribution for the whole audit).
-        if let type = issue.element?.elementType, type == .searchField || type == .textField {
-            if issue.auditType.contains(.textClipped) || issue.auditType.contains(.hitRegion) {
-                return "system field placeholder/hit region, length-independent"
-            }
+        if let type = issue.element?.elementType,
+           type == .searchField || type == .textField,
+           issue.auditType.contains(.textClipped) || issue.auditType.contains(.hitRegion) {
+            return "system field placeholder/hit region, length-independent"
         }
 
         // Unattributed clipped-text/dynamic-type findings. Bisection showed the
diff --git a/Scripts/audit-a11y.sh b/Scripts/audit-a11y.sh
index 9ac3aa0..9119fd7 100755
--- a/Scripts/audit-a11y.sh
+++ b/Scripts/audit-a11y.sh
@@ -43,14 +43,14 @@ DEPLOYMENT_TARGET=$(
     | awk -F' = ' '/ IPHONEOS_DEPLOYMENT_TARGET = /{print $2; exit}'
 )
 
-if [ -z "${DEPLOYMENT_TARGET:-}" ]; then
+if [[ -z "${DEPLOYMENT_TARGET:-}" ]]; then
   echo "error: could not read IPHONEOS_DEPLOYMENT_TARGET" >&2
   exit 1
 fi
 
 DT_MAJOR="${DEPLOYMENT_TARGET%%.*}"
 DT_MINOR="${DEPLOYMENT_TARGET##*.}"
-[ "$DT_MINOR" = "$DEPLOYMENT_TARGET" ] && DT_MINOR=0
+[[ "$DT_MINOR" = "$DEPLOYMENT_TARGET" ]] && DT_MINOR=0
 FLOOR_RANK=$(( DT_MAJOR * 1000 + DT_MINOR ))
 
 echo "    deployment target: $DEPLOYMENT_TARGET (rank $FLOOR_RANK)"
@@ -82,7 +82,7 @@ run_tier() {
   local sim udid label
 
   sim=$(select_sim "$which")
-  if [ -z "$sim" ]; then
+  if [[ -z "$sim" ]]; then
     echo "error: no iPhone simulator at or above iOS $DEPLOYMENT_TARGET installed" >&2
     echo "hint: install one with 'xcodebuild -downloadPlatform iOS'" >&2
     return 1
@@ -94,7 +94,7 @@ run_tier() {
   echo
   echo "==> $which: $label"
 
-  if [ "$which" = "floor" ] && [ "$(echo "$sim" | jq -r .rank)" -ge $(( (DT_MAJOR + 1) * 1000 )) ]; then
+  if [[ "$which" = "floor" ]] && [[ "$(echo "$sim" | jq -r .rank)" -ge $(( (DT_MAJOR + 1) * 1000 )) ]]; then
     echo "    NOTE: nearest installed runtime is a major version above the $DEPLOYMENT_TARGET"
     echo "          deployment target, so this is not true floor coverage."
   fi
@@ -113,7 +113,7 @@ run_tier() {
 }
 
 status=0
-if [ "$TIER" = "both" ]; then
+if [[ "$TIER" = "both" ]]; then
   run_tier floor || status=1
   run_tier current || status=1
 else
@@ -121,7 +121,7 @@ else
 fi
 
 echo
-if [ "$status" -eq 0 ]; then
+if [[ "$status" -eq 0 ]]; then
   echo "==> Done. Findings above are the burndown list for issue #21."
   echo "    They are reported, not enforced — widen"
   echo "    AccessibilityAuditHarness.enforcedAuditTypes as each phase lands."