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/scripts/postbuild.mjs

@@ -0,0 +1,25 @@
+/**
+ * Post-build step: GitHub Pages serves static files only, so every doc route gets a
+ * copy of the SPA shell at dist/<slug>/index.html — deep links (…/docs/omni-message)
+ * then load without relying on a 404 fallback (the site-root 404.html belongs to the
+ * landing page, which would swallow /docs/* misses). Slugs are derived from the
+ * content/ filenames (<slug>.<lang>.md), the same source the router reads.
+ */
+import { copyFileSync, mkdirSync, readdirSync } from "node:fs";
+import { dirname, join } from "node:path";
+import { fileURLToPath } from "node:url";
+
+const pkg = join(dirname(fileURLToPath(import.meta.url)), "..");
+const dist = join(pkg, "dist");
+
+const slugs = new Set(
+  readdirSync(join(pkg, "content"))
+    .map((file) => /^(.+)\.(zh|en)\.md$/.exec(file)?.[1])
+    .filter((slug) => slug !== undefined),
+);
+
+for (const slug of slugs) {
+  mkdirSync(join(dist, slug), { recursive: true });
+  copyFileSync(join(dist, "index.html"), join(dist, slug, "index.html"));
+}
+console.log(`[postbuild] wrote ${slugs.size} route shells under dist/`);