feat: add start-loops.sh for container restart recovery

Ensures cron daemon is running and crontab is installed after container
or host restart. Covers three startup scenarios:
1. Manual: run start-loops.sh after restart
2. Semi-auto: add to ~/.bashrc for start on login
3. Full-auto: add to container entrypoint

Updated loop-engineering.md with container restart instructions.

Author: imroc

.codebuddy/loop-engineering.md

@@ -25,9 +25,14 @@ Each loop runs as a system cron job that invokes `codebuddy -p` (headless mode).
 - Each run is isolated (fresh context, no drift)
 - Works with TKE internal API (runs locally)
 
-**Install:**
+**Start (also use on container/host restart):**
 ```bash
 cd <repo-root>
+.codebuddy/scripts/start-loops.sh   # starts cron daemon + installs crontab
+```
+
+**Install crontab only (if cron daemon already running):**
+```bash
 .codebuddy/scripts/install-cron.sh
 ```
 
@@ -36,6 +41,12 @@ cd <repo-root>
 .codebuddy/scripts/install-cron.sh --remove
 ```
 
+**Container restart:**
+On container or host restart, cron daemon may not be running. Either:
+1. Run `start-loops.sh` manually after restart, or
+2. Add `start-loops.sh` to shell profile (`~/.bashrc`) for auto-start on login, or
+3. Add `start-loops.sh` to container entrypoint for fully automatic startup
+
 **Manual trigger:**
 ```bash
 .codebuddy/scripts/run-loop.sh <loop-type>

.codebuddy/scripts/start-loops.sh

@@ -0,0 +1,42 @@
+#!/usr/bin/env bash
+#
+# Start Loop Engineering — call this on container/host startup
+# Starts cron daemon (if not running) and installs loop crontab.
+#
+# Usage: .codebuddy/scripts/start-loops.sh
+#
+# To auto-start on container boot, add to your entrypoint or profile:
+#   /data/git/req/.codebuddy/scripts/start-loops.sh
+# Or add to ~/.bashrc / /etc/profile.d/
+
+set -euo pipefail
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+REPO_DIR="$(cd "$SCRIPT_DIR/../.." && pwd)"
+
+# 1. Ensure cron daemon is running
+if ! pgrep -x cron >/dev/null 2>&1; then
+    echo "Starting cron daemon..."
+    if command -v systemctl &>/dev/null; then
+        systemctl start cron 2>/dev/null || systemctl start crond 2>/dev/null || cron -f &
+    elif command -v crond &>/dev/null; then
+        crond
+    else
+        echo "Error: cannot start cron daemon" >&2
+        exit 1
+    fi
+    echo "Cron daemon started."
+else
+    echo "Cron daemon already running."
+fi
+
+# 2. Install loop crontab
+echo "Installing loop crontab..."
+"$SCRIPT_DIR/install-cron.sh"
+
+# 3. Verify
+echo ""
+echo "Loop Engineering is active."
+echo "Cron daemon: $(pgrep -x cron >/dev/null && echo 'running' || echo 'NOT running')"
+echo "Crontab:"
+crontab -l 2>/dev/null | grep "loop-engineering-req" || echo "  (no loop entries found)"