refactor: dedupe shared config type definitions

src/config/types.agents-shared.ts

@@ -0,0 +1,37 @@
+import type {
+  SandboxBrowserSettings,
+  SandboxDockerSettings,
+  SandboxPruneSettings,
+} from "./types.sandbox.js";
+
+export type AgentModelConfig =
+  | string
+  | {
+      /** Primary model (provider/model). */
+      primary?: string;
+      /** Per-agent model fallbacks (provider/model). */
+      fallbacks?: string[];
+    };
+
+export type AgentSandboxConfig = {
+  mode?: "off" | "non-main" | "all";
+  /** Agent workspace access inside the sandbox. */
+  workspaceAccess?: "none" | "ro" | "rw";
+  /**
+   * Session tools visibility for sandboxed sessions.
+   * - "spawned": only allow session tools to target sessions spawned from this session (default)
+   * - "all": allow session tools to target any session
+   */
+  sessionToolsVisibility?: "spawned" | "all";
+  /** Container/workspace scope for sandbox isolation. */
+  scope?: "session" | "agent" | "shared";
+  /** Legacy alias for scope ("session" when true, "shared" when false). */
+  perSession?: boolean;
+  workspaceRoot?: string;
+  /** Docker-specific sandbox settings. */
+  docker?: SandboxDockerSettings;
+  /** Optional sandboxed browser settings. */
+  browser?: SandboxBrowserSettings;
+  /** Auto-prune sandbox settings. */
+  prune?: SandboxPruneSettings;
+};