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.

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