feat: 完成 issue #79 [Ti-2] 配方优化求解器集成（网格枚举+坐标下降轻量求解器+solve统一入口，求解器无关契约）

templates/ti-cl4/recipe-optim/_sanity_check.py

@@ -8,6 +8,7 @@ import sys
 
 sys.path.insert(0, os.path.dirname(os.path.abspath(__file__)))
 from problem import ConstraintKind, OptimizationProblem, load_problem  # noqa: E402
+from solver import SolverConfig, solve  # noqa: E402
 
 CONFIG = os.path.join(os.path.dirname(os.path.abspath(__file__)),
                       "config", "recipe_optim.template.yaml")
@@ -48,12 +49,19 @@ def main() -> int:
     if [v.name for v in rt.variables] != [v.name for v in p.variables]:
         failures.append("序列化往返丢失变量")
 
+    # 6) 求解器（#79）端到端：加载模板后能求出可行解
+    sol = solve(p, SolverConfig(grid_steps=7, max_combinations=200000))
+    if not sol.feasible:
+        failures.append(f"求解器未求出可行解: {sol.message}")
+    if sol.strategy != "grid":
+        failures.append(f"求解策略非 grid: {sol.strategy}")
+
     if failures:
         print("❌ recipe-optim 自检失败:")
         for f in failures:
             print("  -", f)
         return 1
-    print("✅ recipe-optim 自检通过（5 能力点）")
+    print("✅ recipe-optim 自检通过（6 能力点）")
     return 0