chore: archive refactor milestones and remove structural quality-gates task

- Remove structural quality gates task and references from task-27 roadmap.
- Remove structural-gates-adjacent work from scripts/positioning cleanup context, including check-main-lines adjustments.
- Archive completed backlog tasks 11 and 27.7 by moving them to completed directory.
- Finish task-27.5 module split by moving/anonymizing anki-integration and renderer positioning files into their dedicated directories and updating paths.

scripts/check-main-lines.sh

@@ -1,25 +1,71 @@
 #!/usr/bin/env bash
 set -euo pipefail
 
-target="${1:-1500}"
-file="${2:-src/main.ts}"
+usage() {
+	cat <<'EOF'
+Usage:
+  ./scripts/check-main-lines.sh [target-lines] [file]
+  ./scripts/check-main-lines.sh --target <target-lines> --file <path>
+
+  target-lines default: 1500
+  file default: src/main.ts
+EOF
+}
+
+target="1500"
+file="src/main.ts"
+
+if (($# == 1)) && [[ "$1" == "-h" || "$1" == "--help" ]]; then
+	usage
+	exit 0
+fi
+
+if [[ $# -ge 1 && "$1" != --* ]]; then
+	target="$1"
+	if [[ $# -ge 2 ]]; then
+		file="$2"
+	fi
+	shift $(($# > 1 ? 2 : 1))
+fi
+
+while [[ $# -gt 0 ]]; do
+	case "$1" in
+	--target)
+		target="$2"
+		shift 2
+		;;
+	--file)
+		file="$2"
+		shift 2
+		;;
+	--help)
+		usage
+		exit 0
+		;;
+	*)
+		echo "[ERROR] Unknown argument: $1" >&2
+		usage
+		exit 1
+		;;
+	esac
+done
 
 if [[ ! -f "$file" ]]; then
-  echo "[ERROR] File not found: $file" >&2
-  exit 1
+	echo "[ERROR] File not found: $file" >&2
+	exit 1
 fi
 
 if ! [[ "$target" =~ ^[0-9]+$ ]]; then
-  echo "[ERROR] Target line count must be an integer. Got: $target" >&2
-  exit 1
+	echo "[ERROR] Target line count must be an integer. Got: $target" >&2
+	exit 1
 fi
 
-actual="$(wc -l < "$file" | tr -d ' ')"
+actual="$(wc -l <"$file" | tr -d ' ')"
 
 echo "[INFO] $file lines: $actual (target: <= $target)"
-if (( actual > target )); then
-  echo "[ERROR] Line gate failed: $actual > $target" >&2
-  exit 1
+if ((actual > target)); then
+	echo "[ERROR] Line gate failed: $actual > $target" >&2
+	exit 1
 fi
 
 echo "[OK] Line gate passed"