diff --git a/agent/multitrack_runner.py b/agent/multitrack_runner.py
index 49d6d3a..b449662 100644
--- a/agent/multitrack_runner.py
+++ b/agent/multitrack_runner.py
@@ -335,8 +335,13 @@ def train_multitrack(model, first_env, total_timesteps, steps_per_switch,
         if save_dir:
             try:
                 os.makedirs(save_dir, exist_ok=True)
+                # Save numbered checkpoint — NEVER overwrite previous checkpoints.
+                # Every segment is preserved so we can return to any point in training.
+                ckpt_name = f'checkpoint_{steps_done:07d}'
+                model.save(os.path.join(save_dir, ckpt_name))
+                # Also overwrite 'model' for crash-recovery (latest weights)
                 model.save(os.path.join(save_dir, 'model'))
-                log(f'[W3 Runner] Checkpoint saved at step {steps_done:,}')
+                log(f'[W3 Runner] Checkpoint saved: {ckpt_name} (step {steps_done:,})')
             except Exception as e:
                 log(f'[W3 Runner] WARNING: checkpoint save failed: {e}')
 
diff --git a/agent/outerloop-results/autoresearch_phase2_log.txt b/agent/outerloop-results/autoresearch_phase2_log.txt
index 9c76714..ae9fc81 100644
--- a/agent/outerloop-results/autoresearch_phase2_log.txt
+++ b/agent/outerloop-results/autoresearch_phase2_log.txt
@@ -749,3 +749,16 @@
 [2026-04-17 14:45:13] [Champion] 🏆 NEW BEST! Trial 3: mean_reward=90.0000 params={'r': 90}
 [2026-04-17 14:45:13] [Champion] 🏆 NEW BEST! Trial 5: mean_reward=75.0000 params={'n_steer': 8}
 [2026-04-17 14:45:13] [AutoResearch] Only 1 results — using random proposal.
+[2026-04-17 22:10:12] [AutoResearch] GP UCB top-5 candidates:
+[2026-04-17 22:10:12]   UCB=2.3107 mu=0.3981 sigma=0.9563 params={'n_steer': 9, 'n_throttle': 2, 'learning_rate': 0.001405531880392808, 'timesteps': 26173}
+[2026-04-17 22:10:12]   UCB=2.3049 mu=0.8602 sigma=0.7224 params={'n_steer': 9, 'n_throttle': 3, 'learning_rate': 0.001793493447174312, 'timesteps': 19198}
+[2026-04-17 22:10:12]   UCB=2.2813 mu=0.4904 sigma=0.8954 params={'n_steer': 9, 'n_throttle': 4, 'learning_rate': 0.0011616192816742616, 'timesteps': 13887}
+[2026-04-17 22:10:12]   UCB=2.2767 mu=0.5194 sigma=0.8787 params={'n_steer': 9, 'n_throttle': 4, 'learning_rate': 0.0011646447444663046, 'timesteps': 21199}
+[2026-04-17 22:10:12]   UCB=2.2525 mu=0.6254 sigma=0.8136 params={'n_steer': 9, 'n_throttle': 3, 'learning_rate': 0.0010196345864901517, 'timesteps': 22035}
+[2026-04-17 22:10:12] [Champion] 🏆 NEW BEST! Trial 1: mean_reward=50.0000 params={'n_steer': 5}
+[2026-04-17 22:10:12] [Champion] 🏆 NEW BEST! Trial 1: mean_reward=80.0000 params={'n_steer': 7}
+[2026-04-17 22:10:12] [Champion] 🏆 NEW BEST! Trial 0: mean_reward=50.0000 params={'r': 50}
+[2026-04-17 22:10:12] [Champion] 🏆 NEW BEST! Trial 1: mean_reward=80.0000 params={'r': 80}
+[2026-04-17 22:10:12] [Champion] 🏆 NEW BEST! Trial 3: mean_reward=90.0000 params={'r': 90}
+[2026-04-17 22:10:12] [Champion] 🏆 NEW BEST! Trial 5: mean_reward=75.0000 params={'n_steer': 8}
+[2026-04-17 22:10:12] [AutoResearch] Only 1 results — using random proposal.
diff --git a/agent/outerloop-results/autoresearch_phase3_log.txt b/agent/outerloop-results/autoresearch_phase3_log.txt
index 1ea86fb..9b611bd 100644
--- a/agent/outerloop-results/autoresearch_phase3_log.txt
+++ b/agent/outerloop-results/autoresearch_phase3_log.txt
@@ -400,3 +400,8 @@
 [2026-04-17 14:45:26] [Wave3] Only 0 results — using random proposal.
 [2026-04-17 14:45:26] [Champion] 🏆 NEW BEST! Trial 3: score=1500.00 (mini_monaco=1500.0) params={'learning_rate': 0.0002, 'steps_per_switch': 8000, 'total_timesteps': 150000}
 [2026-04-17 14:45:26] [Champion] 🏆 NEW BEST! Trial 1: score=2000.00 (mini_monaco=2000.0) params={}
+[2026-04-17 22:10:26] [Wave3] Seed trial 1/2: using hardcoded params.
+[2026-04-17 22:10:26] [Wave3] Seed trial 2/2: using hardcoded params.
+[2026-04-17 22:10:26] [Wave3] Only 0 results — using random proposal.
+[2026-04-17 22:10:26] [Champion] 🏆 NEW BEST! Trial 3: score=1500.00 (mini_monaco=1500.0) params={'learning_rate': 0.0002, 'steps_per_switch': 8000, 'total_timesteps': 150000}
+[2026-04-17 22:10:26] [Champion] 🏆 NEW BEST! Trial 1: score=2000.00 (mini_monaco=2000.0) params={}