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/docs/test/toc.test.ts

@@ -0,0 +1,27 @@
+import { describe, expect, it } from "vitest";
+import { extractToc, slugifyHeading } from "../src/lib/toc";
+
+describe("slugifyHeading", () => {
+  it("lowercases latin, hyphenates spaces, keeps CJK", () => {
+    expect(slugifyHeading("Agent Loop")).toBe("agent-loop");
+    expect(slugifyHeading("消息信封")).toBe("消息信封");
+    expect(slugifyHeading("Tool Calls (streaming)")).toBe("tool-calls-streaming");
+  });
+});
+
+describe("extractToc", () => {
+  it("collects ##/### headings and skips fenced code blocks", () => {
+    const body = [
+      "## Envelope",
+      "```ts",
+      "## not a heading",
+      "```",
+      "### Payload kinds",
+      "#### too deep",
+    ].join("\n");
+    expect(extractToc(body)).toEqual([
+      { id: "envelope", text: "Envelope", depth: 2 },
+      { id: "payload-kinds", text: "Payload kinds", depth: 3 },
+    ]);
+  });
+});