feat: dedicated auto-healing agent — sidecar container + pi agent definition

- auto-healer/Dockerfile: lightweight Alpine container with Docker CLI
- auto-healer/auto-heal-agent.sh: real-time fault detection + remediation engine
  - Detects: crash, OOM, DB disconnect, gateway down, disk pressure
  - Fixes: restart, rollback, nginx reload, prune, escalate
  - Sliding window restart tracking (3/hr max)
- auto-healer/docker-compose.healer.yml: sidecar deployment config
  - Mounts Docker socket for event monitoring
  - Host network mode for health checks
  - Persistent state in /var/state/falah
- .pi/agents/auto-healer.md: pi agent definition for manual invocation

auto-healer/Dockerfile

@@ -0,0 +1,25 @@
+# ── Falah Mobile — Auto-Healer Agent ──────────────────────────
+# Dedicated container that monitors the app stack and auto-fixes faults.
+# Runs alongside the main app container with access to Docker socket.
+# ──────────────────────────────────────────────────────────────
+
+FROM alpine:3.19
+
+RUN apk add --no-cache curl docker-cli bash jq
+
+WORKDIR /app
+
+COPY auto-heal-agent.sh /app/auto-heal-agent.sh
+RUN chmod +x /app/auto-heal-agent.sh
+
+# Runtime state
+RUN mkdir -p /var/log/falah /var/state/falah
+
+# Monitor interval in seconds (default 30)
+ENV CHECK_INTERVAL=30
+ENV CONTAINER_NAME=falah-mobile-staging
+ENV HEALTH_URL=http://localhost:4014/mobile/api/health
+ENV GATEWAY_URL=http://localhost:7878/mobile/api/health
+ENV MAX_RESTARTS_PER_HOUR=3
+
+CMD ["/app/auto-heal-agent.sh"]