Initialize repository with harness code and assets

Initial import of all source code, config, and README assets: the
packages workspace (cli, core, server, web, docs, landing, skills),
build scripts, tooling config, and CI workflows.

Includes the data-layout revision made on this branch: the local data
root defaults to ~/.penguin/data (PENGUIN_HOME still overrides; the
installer keeps its binaries in ~/.penguin), and every Agent lives
under <project>/agents/<agent>/ — path helpers, the three
agent-enumeration scans, the system prompt, built-in Skills, tests
and docs all follow the new layout.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018ihk8iQuo3kv2aPjAYEPuR

packages/cli/test/chat.test.ts

@@ -0,0 +1,45 @@
+import { describe, expect, it } from "vitest";
+import { decideSigint } from "../src/commands/chat.js";
+import { parseApprovalAnswer } from "../src/approval.js";
+
+describe("decideSigint (Ctrl-C 行为状态机)", () => {
+  it("approving → deny（无论缓冲区是否有内容）", () => {
+    expect(decideSigint("approving", false)).toBe("deny");
+    expect(decideSigint("approving", true)).toBe("deny");
+  });
+
+  it("running → abort（中断当前 Task，不退出）", () => {
+    expect(decideSigint("running", false)).toBe("abort");
+    expect(decideSigint("running", true)).toBe("abort");
+  });
+
+  it("idle + 有输入 → clear（清空缓冲区）", () => {
+    expect(decideSigint("idle", true)).toBe("clear");
+  });
+
+  it("idle + 无输入 → confirm-exit（弹出 y/N 退出确认）", () => {
+    expect(decideSigint("idle", false)).toBe("confirm-exit");
+  });
+
+  it("confirming-exit → exit（确认中再次 Ctrl-C 直接退出）", () => {
+    expect(decideSigint("confirming-exit", false)).toBe("exit");
+    expect(decideSigint("confirming-exit", true)).toBe("exit");
+  });
+});
+
+describe("parseApprovalAnswer", () => {
+  it("y / yes（trim、不区分大小写）→ allow；n / no → deny", () => {
+    expect(parseApprovalAnswer("y")).toBe("allow");
+    expect(parseApprovalAnswer("  YES \n")).toBe("allow");
+    expect(parseApprovalAnswer("Y")).toBe("allow");
+    expect(parseApprovalAnswer("n")).toBe("deny");
+    expect(parseApprovalAnswer("NO")).toBe("deny");
+  });
+  it("空/无关输入用 fallback（缺省 deny；工具审批传 allow）", () => {
+    expect(parseApprovalAnswer("")).toBe("deny"); // default fallback
+    expect(parseApprovalAnswer("nope")).toBe("deny");
+    expect(parseApprovalAnswer("", "allow")).toBe("allow"); // tool approval defaults to allow
+    expect(parseApprovalAnswer("nope", "allow")).toBe("allow");
+    expect(parseApprovalAnswer("n", "allow")).toBe("deny"); // explicit n still denies
+  });
+});