chore: remove outdated documentation and reference files

- Remove debugging service documentation (DEBUgging_SERVICES.md)
- Remove development logs policy and quick reference guides
- Remove E2E test creation summary
- Remove gift certificate example file
- Remove GitHub pull summary documentation

scripts/monitoring/nightly_health_check.sh

@@ -0,0 +1,53 @@
+#!/bin/bash
+#
+# AITBC Nightly Health Check
+# Runs master planning cleanup and reports documentation/planning cleanliness.
+#
+set -e
+
+PROJECT_ROOT="/opt/aitbc"
+PLANNING_DIR="$PROJECT_ROOT/docs/10_plan"
+DOCS_DIR="$PROJECT_ROOT/docs"
+MASTER_WORKFLOW="$PROJECT_ROOT/scripts/run_master_planning_cleanup.sh"
+
+GREEN='\033[0;32m'
+YELLOW='\033[1;33m'
+RED='\033[0;31m'
+NC='\033[0m'
+
+log_info() { echo -e "${GREEN}[INFO]${NC} $1"; }
+log_warn() { echo -e "${YELLOW}[WARN]${NC} $1"; }
+log_err()  { echo -e "${RED}[ERROR]${NC} $1"; }
+
+log_info "Starting nightly health check..."
+
+if [[ -x "$MASTER_WORKFLOW" ]]; then
+  log_info "Running master planning cleanup workflow..."
+  if ! "$MASTER_WORKFLOW"; then
+    log_warn "Master workflow reported issues; continuing to collect stats."
+  fi
+else
+  log_warn "Master workflow script not found or not executable: $MASTER_WORKFLOW"
+fi
+
+log_info "Collecting documentation/planning stats..."
+planning_files=$(find "$PLANNING_DIR" -name "*.md" | wc -l)
+completed_files=$(find "$DOCS_DIR/completed" -name "*.md" | wc -l)
+archive_files=$(find "$DOCS_DIR/archive" -name "*.md" | wc -l)
+documented_files=$(find "$DOCS_DIR" -name "documented_*.md" | wc -l)
+completion_markers=$(find "$PLANNING_DIR" -name "*.md" -exec grep -l "✅" {} \; | wc -l)
+
+echo "--- Nightly Health Check Summary ---"
+echo "Planning files (docs/10_plan): $planning_files"
+echo "Completed files (docs/completed): $completed_files"
+echo "Archive files (docs/archive): $archive_files"
+echo "Documented files (docs/): $documented_files"
+echo "Files with completion markers: $completion_markers"
+
+if [[ $completion_markers -eq 0 ]]; then
+  log_info "Planning cleanliness OK (0 completion markers)."
+else
+  log_warn "Completion markers remain in planning files ($completion_markers)."
+fi
+
+log_info "Nightly health check completed."