fix: align headless interactive tool behavior with bidirectional parity (#894)

src/tools/interactivePolicy.ts

@@ -0,0 +1,24 @@
+// Interactive tool capability policy shared across UI/headless/SDK-compatible paths.
+// This avoids scattering name-based checks throughout approval handling.
+
+const INTERACTIVE_APPROVAL_TOOLS = new Set([
+  "AskUserQuestion",
+  "EnterPlanMode",
+  "ExitPlanMode",
+]);
+
+const RUNTIME_USER_INPUT_TOOLS = new Set(["AskUserQuestion", "ExitPlanMode"]);
+
+const HEADLESS_AUTO_ALLOW_TOOLS = new Set(["EnterPlanMode"]);
+
+export function isInteractiveApprovalTool(toolName: string): boolean {
+  return INTERACTIVE_APPROVAL_TOOLS.has(toolName);
+}
+
+export function requiresRuntimeUserInput(toolName: string): boolean {
+  return RUNTIME_USER_INPUT_TOOLS.has(toolName);
+}
+
+export function isHeadlessAutoAllowTool(toolName: string): boolean {
+  return HEADLESS_AUTO_ALLOW_TOOLS.has(toolName);
+}