Set replicate_path on grug WandbConfig so tracker_metrics.jsonl is written

All three grug launch templates (moe, base, modular_opt) constructed WandbConfig
without replicate_path, so WandbTracker.finish() skipped writing
tracker_metrics.jsonl. Downstream consumers like validate_canary_metrics.py then
failed with FileNotFoundError. Match experiments/defaults.py by setting
replicate_path=this_output_path() at construction time.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: yonromai

experiments/grug/base/launch.py

@@ -141,6 +141,7 @@ def run_grug_base_trial(config: GrugBaseLaunchConfig) -> None:
             tags=["grug", "template"],
             group="grug-base-trial",
             name=None,  # filled from run_id in _resolve_tracker
+            replicate_path=this_output_path(),
         ),
         optimizer=versioned(
             AdamConfig(

experiments/grug/modular_opt/launch.py

@@ -247,6 +247,7 @@ def run_grug_modular_opt_trial(config: GrugModularOptLaunchConfig) -> None:
             tags=["grug", "template", "modular_opt", "issue-3075"],
             group="grug-modular-opt-trial",
             name=None,  # filled from run_id in _resolve_tracker
+            replicate_path=this_output_path(),
         ),
         optimizer=versioned(
             GrugParamGroupAdamConfig(

experiments/grug/moe/launch.py

@@ -146,6 +146,7 @@ def run_grug_moe_trial(config: GrugMoeLaunchConfig) -> None:
             tags=["grug", "template", "moe"],
             group="grug-moe-trial",
             name=None,  # filled from run_id in _resolve_tracker
+            replicate_path=this_output_path(),
         ),
         optimizer=versioned(
             AdamConfig(