feat(ops): launchd jobs (nightly + market-open) + caffeinate + install scripts

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016DvdRZkyCy9NJpHYDdPqmS

scripts/uninstall_launchd.sh

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+#!/usr/bin/env bash
+# Remove the launchd jobs and print how to clear the wake schedule.
+set -euo pipefail
+LA="$HOME/Library/LaunchAgents"
+for p in caffeinate nightly market_open; do
+  launchctl unload "$LA/ai.tradingagent.$p.plist" 2>/dev/null || true
+  rm -f "$LA/ai.tradingagent.$p.plist"
+  echo "removed ai.tradingagent.$p"
+done
+echo
+echo "Also clear the nightly wake schedule (needs sudo):"
+echo "  sudo pmset repeat cancel"