fix: scip unavailable

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Changelog
 
+## Unreleased
+
+- Fixed `select_solver` crashing on `subprocess.TimeoutExpired` when a solver binary (SCIP, CBC, bare `gurobi`/`cplex` shells) exceeds Pyomo's 2-second version probe on cold starts. Timeouts are now caught as backend-unavailable conditions.
+
 ## 2.0.1 - 2026-04-27
 
 - Removed pre-v2 dead code (model.py, pyaugmecon.py, process_handler.py, queue_handler.py, solver_adapter.py, solver_process.py) superseded by the solver/ subpackage.

src/pyaugmecon/solver/adapter.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import contextlib
+import subprocess
 from collections.abc import Mapping
 from dataclasses import dataclass
 from enum import StrEnum
@@ -178,6 +179,7 @@ def release_solver(solver: SolverLike, backend_name: str) -> None:
     AttributeError,
     ImportError,
     OSError,
+    subprocess.TimeoutExpired,
 )