chore: 添加 CI 配置、codecov 和测试 mock 基础设施

Co-Authored-By: glm-5-turbo <zai-org@claude-code-best.win>

tests/mocks/toolContext.ts

@@ -0,0 +1,52 @@
+/**
+ * Shared minimal ToolUseContext stub for tool unit tests.
+ *
+ * Provides only the fields tools actually access in tests:
+ *  - getAppState() returns a context with empty rule arrays for every source
+ *  - toolUseId / parentMessageId / assistantMessageId / turnId can be
+ *    overridden per test for budget tracking tests
+ *
+ * Usage:
+ *   import { mockToolContext } from 'tests/mocks/toolContext'
+ *   const ctx = mockToolContext({ toolUseId: 't1' })
+ *
+ * Per memory feedback "Mock dependency not subject" — this exists so each
+ * tool test file does not redefine the same partial stub.
+ */
+
+const emptyRules = {
+  user: [],
+  project: [],
+  local: [],
+  session: [],
+  cliArg: [],
+}
+
+export interface MockToolContextOptions {
+  toolUseId?: string
+  parentMessageId?: string
+  assistantMessageId?: string
+  turnId?: string
+  /** Override toolPermissionContext fields (e.g. mode, alwaysAllowRules). */
+  permissionOverrides?: Record<string, unknown>
+}
+
+export function mockToolContext(opts: MockToolContextOptions = {}): never {
+  return {
+    toolUseId: opts.toolUseId,
+    parentMessageId: opts.parentMessageId,
+    assistantMessageId: opts.assistantMessageId,
+    turnId: opts.turnId,
+    getAppState: () => ({
+      toolPermissionContext: {
+        mode: 'default',
+        additionalWorkingDirectories: new Set(),
+        alwaysAllowRules: { ...emptyRules },
+        alwaysDenyRules: { ...emptyRules },
+        alwaysAskRules: { ...emptyRules },
+        isBypassPermissionsModeAvailable: false,
+        ...(opts.permissionOverrides ?? {}),
+      },
+    }),
+  } as never
+}