Jev classifier in tandem with the LLM Sentry

- Jev (TypeSafe, direct) triages mode and task type with confidence
- Its call stands at >= 70% on both and no split; otherwise the LLM
  Sentry decides (unsure, split needs subtasks, or Jev down)
- Jev flights obey the same budget, flock cap, timeout and log
- Tests for every path; flight log is nil-safe
- start.command reads TYPESAFE_API_KEY and threshold from .env

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UQnSw4RRWp8uqpj3nsnnXF

main.go

@@ -90,6 +90,7 @@ func cmdRun(args []string) {
 
 	brain := NewBrain()
 	p.Flock = NewFlock(brain, g, flog)
+	p.Flock.SetClassifier(NewJev())
 	ctx, stop := signal.NotifyContext(context.Background(), os.Interrupt)
 	defer stop()