Telemetry: discovery took 6-30s ON the single scheduler, freezing ingest/arm
so the trigger read stale bars — the real 'late edge detection'. Now discovery
runs on its own daemon thread with a dedicated DB connection; the watchlist it
mutates is a lock-guarded Watchlist (list-like drop-in, no torn reads); the
scheduler discover step auto-disables (single-writer). Loop is now 3 fast
threads (entries/exits/discovery) + slow scheduler for tolerant work.
Also: nightly_tune writes a heartbeat every run, so the boot alert distinguishes
'tuner not running' (real) from 'ran, no profitable ORB config, kept params'
(expected — the strategy has no edge). Kills the misleading Telegram alarm.
543 tests green.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
