docs: watchdog + caffeinate + engine relocation

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

HANDOFF.md

@@ -27,7 +27,12 @@ The repo is authoritative; project memory has deeper history.
   = REAL MONEY page (NOT STARTED until Phase 2). Shared renderer:
   `jaxperro/trading/copybot-section.js`. `?botFeed=`/`?rmFeed=` query params
   override feeds for local testing.
-- **Daily pipeline** (Mac launchd 08:00, fires on wake — typically ~10:00)
+- **Watchdog live (2026-07-08)**: Fly `/health` check auto-restarts a dark
+  machine; GH Actions `watchdog.yml` probes from GitHub's infra and pings
+  Discord after 3 failed probes. `copytrade.py` now lives at repo root
+  (archive/ is 100% retired code again).
+- **Daily pipeline** (Mac launchd 08:00, fires on wake — typically ~10:00,
+  caffeinate-wrapped)
   appends one live-vs-model row/day to `live/history/calibration.csv` and
   re-derives everything under the new rules: entries cursors now invalidate
   daily, `_open_split` folds by the `redeemable` flag, `rtally` splits SOLD.