Add daily wiki content export

Export script pulls all Outline documents via API and writes them as
flat markdown files to content/wiki/ with frontmatter metadata.
Cron wrapper auto-commits changes daily.

scripts/export-content-cron.sh

@@ -0,0 +1,33 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Daily wiki content export — run via cron:
+#   0 4 * * * /path/to/wiki-ghostguild/scripts/export-content-cron.sh >> /var/log/wiki-export.log 2>&1
+
+REPO_DIR="$(cd "$(dirname "$0")/.." && pwd)"
+cd "$REPO_DIR"
+
+# Source env vars (line-by-line to handle unquoted values with spaces)
+while IFS='=' read -r key value; do
+  [[ -z "$key" || "$key" =~ ^# ]] && continue
+  export "$key=$value"
+done < outline.env
+
+# Map Outline's URL to OUTLINE_URL if not already set
+export OUTLINE_URL="${OUTLINE_URL:-$URL}"
+
+# OUTLINE_API_TOKEN must be set in the environment or in outline.env
+if [[ -z "${OUTLINE_API_TOKEN:-}" ]]; then
+  echo "Error: OUTLINE_API_TOKEN is not set" >&2
+  exit 1
+fi
+
+# Run export
+node scripts/export-content.js
+
+# Commit and push if there are changes
+git add content/wiki/
+if ! git diff --cached --quiet; then
+  git commit -m "wiki content export $(date +%Y-%m-%d)"
+  git push
+fi