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/core/test/wake-signal.test.ts

@@ -0,0 +1,33 @@
+/**
+ * Process-lifecycle behavior tests for WakeSignal.
+ */
+import { spawnSync } from "node:child_process";
+import { describe, expect, it } from "vitest";
+
+describe("WakeSignal", () => {
+  it("keeps a standalone process alive while wait() is pending without leaving timers behind", () => {
+    const moduleUrl = new URL("../src/environment/tools/background/wake-signal.ts", import.meta.url)
+      .href;
+    const script = `
+      const { WakeSignal } = await import(${JSON.stringify(moduleUrl)});
+
+      await new WakeSignal().wait(50);
+      process.stdout.write("timeout\\n");
+
+      const signal = new WakeSignal();
+      setTimeout(() => signal.notify(), 10);
+      await signal.wait(60_000);
+      process.stdout.write("notified\\n");
+    `;
+
+    const result = spawnSync(
+      process.execPath,
+      ["--import", "tsx", "--input-type=module", "--eval", script],
+      { encoding: "utf8", timeout: 3_000 },
+    );
+
+    expect(result.error).toBeUndefined();
+    expect(result.status).toBe(0);
+    expect(result.stdout).toBe("timeout\nnotified\n");
+  });
+});