refactor(permission-system): simplify policy and autoreview flow

pi-permission-system/test/helpers/handler-fixtures.ts

@@ -128,8 +128,6 @@ export function makeToolRegistry(
 ): ToolRegistry {
   return {
     getAll: vi.fn().mockReturnValue([{ name: "read" }, { name: "bash" }]),
-    getActive: vi.fn().mockReturnValue(["read", "bash"]),
-    setActive: vi.fn(),
     ...overrides,
   };
 }
@@ -212,7 +210,7 @@ export function makeBashCommandCheck(opts: {
  *
  * The `session` override bag maps to the real collaborators:
  * - `checkPermission` → applied to `permissionManager.checkPermission`
- * - `getActiveSkillEntries`, `getInfrastructureReadDirs`, `getToolPreviewLimits`
+ * - `getActiveSkillEntries`, `getToolPreviewLimits`
  *   → applied as vi.spyOn overrides on the real session
  * - `resolveAgentName` → applied as a vi.spyOn override on the real session
  *
@@ -283,11 +281,6 @@ export function makeHandler(overrides?: {
       so.getActiveSkillEntries,
     );
   }
-  if (so?.getInfrastructureReadDirs) {
-    vi.spyOn(session, "getInfrastructureReadDirs").mockImplementation(
-      so.getInfrastructureReadDirs,
-    );
-  }
   if (so?.getToolPreviewLimits) {
     vi.spyOn(session, "getToolPreviewLimits").mockImplementation(
       so.getToolPreviewLimits,