fix: address CHANGES_REQUESTED review feedback on PR #4174

- email-delivery-test-helper.sh: replace grep -ciE with grep -oiE | wc -l
  for high-risk and medium-risk phrase counting to accurately count
  occurrences (not just matching lines) — addresses Gemini review
- accessibility-helper.sh: update font-size regex from 12px to 14px
  threshold (([0-9]|1[0-3])px) and tighten em branch to <=0.875em;
  update warning message to match — aligns code with docs (CodeRabbit)
- accessibility-audit.md: update table entry from '12px' to '14px' to
  match helper script threshold; replace GNU-only sed '\x1b' ANSI-strip
  with portable bash $'\033' literal ESC byte for BSD/macOS compat
- tests/test-email-thread-reconstruction.sh: change grep -qE backslash
  pattern from '\\' to '\\+' (one-or-more quantifier) to detect
  single Windows-style path separators in Markdown links

Author: alex-solovyev

.agents/scripts/accessibility-helper.sh

@@ -720,9 +720,9 @@ check_email_a11y() {
 
 	# Check: inline styles with small font sizes
 	local small_fonts
-	small_fonts=$(_grep_count 'font-size:\s*(([0-9]|1[01])px|0\.[0-9]+em)' "$file")
+	small_fonts=$(_grep_count 'font-size:\s*(([0-9]|1[0-3])px|0\.(0[0-9]*|[1-7][0-9]*|8([0-6][0-9]*|7[0-5]?))em)' "$file")
 	if [[ "$small_fonts" -gt 0 ]]; then
-		_append "WARN: $small_fonts instance(s) of font-size below 12px"
+		_append "WARN: $small_fonts instance(s) of font-size below 14px"
 		_append "  WCAG 1.4.4 — Text should be resizable; small fonts harm readability"
 		warnings=$((warnings + 1))
 	else

.agents/scripts/email-delivery-test-helper.sh

@@ -142,7 +142,7 @@ analyze_spam_content() {
 	local high_risk_found=0
 	for phrase in "${high_risk_phrases[@]}"; do
 		local count
-		count=$(echo "$content" | grep -ciE "$phrase" || true)
+		count=$( (echo "$content" | grep -oiE "$phrase" || true) | wc -l | tr -d ' ')
 		count="${count:-0}"
 		if [[ "$count" -gt 0 ]]; then
 			print_warning "High-risk phrase found: '$phrase' ($count occurrences)"
@@ -194,7 +194,7 @@ analyze_spam_content() {
 	local medium_risk_found=0
 	for phrase in "${medium_risk_phrases[@]}"; do
 		local count
-		count=$(echo "$content" | grep -ciE "$phrase" || true)
+		count=$( (echo "$content" | grep -oiE "$phrase" || true) | wc -l | tr -d ' ')
 		count="${count:-0}"
 		if [[ "$count" -gt 0 ]]; then
 			medium_risk_found=$((medium_risk_found + 1))

.agents/services/accessibility/accessibility-audit.md

@@ -104,7 +104,7 @@ accessibility-helper.sh email ./templates/welcome.html
 | Missing `alt` on images | 1.1.1 Non-text Content | Error |
 | Missing `lang` attribute | 3.1.1 Language of Page | Error |
 | Layout tables without `role="presentation"` | 1.3.1 Info and Relationships | Warning |
-| Font size below 12px | 1.4.4 Resize Text | Warning |
+| Font size below 14px | 1.4.4 Resize Text | Warning |
 | Generic link text ("click here") | 2.4.4 Link Purpose | Warning |
 | No heading structure | 1.3.1 Info and Relationships | Warning |
 | Colour-only indicators | 1.4.1 Use of Colour | Warning |
@@ -234,7 +234,7 @@ Add accessibility checks to build pipelines:
 ```bash
 # Fail build if Lighthouse accessibility score drops below 90
 score=$(accessibility-helper.sh lighthouse https://staging.example.com \
-  | sed 's/\x1b\[[0-9;]*m//g' | sed -E -n 's/.*Score: ([0-9]+).*/\1/p')
+  | sed $'s/\033\\[[0-9;]*m//g' | sed -E -n 's/.*Score: ([0-9]+).*/\1/p')
 if [[ -z "$score" ]]; then
   echo "Error: Could not parse accessibility score from output." >&2
   exit 1