fix(trainer): don't resolve Hub envs when parsing orchestrator configs (#3096)

* fix(trainer): don't resolve Hub envs when parsing orchestrator configs

discover_runs() builds OrchestratorConfig to read training-relevant fields, but
constructing a v1 env config eagerly resolves (imports/installs) its taskset/
harness plugins from the Environments Hub. On the trainer that 404s for private
hub envs (taskset.id = owner/name@version) — the trainer has no Hub credentials —
so get_orchestrator_config() returns None and the run is silently skipped.

Parse under verifiers' skip_plugin_install contextvar so the trainer never
touches the Hub; the env server still installs the plugin at runtime.

Depends on verifiers exposing `skip_plugin_install` — bump deps/verifiers to a
commit that includes it before this lands.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

* chore(trainer): sort imports to satisfy ruff isort (I001)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: eexwhyzee

src/prime_rl/trainer/runs.py

@@ -236,9 +236,20 @@ def get_orchestrator_config(self, run_id: str) -> Optional["OrchestratorConfig"]
             with open(config_path, "rb") as f:
                 config_dict = tomli.load(f)
 
+            from verifiers.v1.loaders import skip_plugin_install
+
             from prime_rl.configs.orchestrator import OrchestratorConfig
 
-            config = OrchestratorConfig(**config_dict)
+            # The trainer only reads training-relevant fields (model, lora, seq_len, buffers,
+            # env names) and never runs the env, so skip resolving/installing taskset/harness
+            # plugins from the Environments Hub while parsing. Otherwise a private v1 hub env
+            # (`taskset.id = owner/name@version`) 404s here — the trainer has no Hub creds — and
+            # the run is silently skipped. The env server still installs the plugin at runtime.
+            token = skip_plugin_install.set(True)
+            try:
+                config = OrchestratorConfig(**config_dict)
+            finally:
+                skip_plugin_install.reset(token)
         except Exception as e:
             if error_path.parent.exists():
                 with open(error_path, "w") as f: