Add automatic ingestion scheduling (server-side + client push)

[evansenter]

Problem

Ingestion only runs lazily via ensure_fresh_data() inside query tools. If no queries are made, data goes stale indefinitely — last ingestion was Jan 31 despite the server being active.

Additionally, client machines (Mac) have no automated push schedule to sync their local session data to the server.

Solution

Part 1: Server-side background ingestion

Add a FastMCP lifespan with a background asyncio task that runs ingest_logs() every 5 minutes, plus initial ingest on startup.

Part 2: Client-side scheduled push

Add LaunchAgent (macOS) and systemd timer (Linux) templates for periodic agent-session-analytics-cli push, wired into make install-client.

Files

• server.py — lifespan + background loop
• New push schedule templates (plist, systemd timer/service)
• New install/uninstall scripts
• Makefile update
• Documentation