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/nightly.sh

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+#!/usr/bin/env bash
+# launchd wrapper for the nightly research run (00:00 CT).
+cd /Users/aryan/Documents/GitHub/trading-agent
+export PATH="/opt/homebrew/bin:$PATH"
+mkdir -p state/logs
+exec uv run python -m orchestration.run_nightly >> state/logs/launchd_nightly.log 2>&1