fix(config): preserve bash permission compatibility

Keep legacy tools.bash migration mapped to the single bash permission since the permission layer already expands it to pwsh and powershell. This preserves the backward-compatible config shape while retaining shell compatibility.

packages/opencode/src/config/config.ts

@@ -588,8 +588,6 @@ export namespace Config {
           permission.edit = action
         } else if (tool === "bash") {
           permission.bash = action
-          permission.pwsh = action
-          permission.powershell = action
         } else {
           permission[tool] = action
         }