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/server/src/db/database.ts

@@ -0,0 +1,28 @@
+/**
+ * SQLite connection & initialization (node:sqlite DatabaseSync).
+ *
+ * Single process, single writer: a synchronous API is sufficient and avoids a connection
+ * pool; WAL mode and foreign key constraints are enabled. Table-creation SQL runs on open
+ * (idempotent), with no migration branches (product not yet released).
+ */
+import { mkdirSync } from "node:fs";
+import path from "node:path";
+import type { DatabaseSync } from "node:sqlite";
+import { SCHEMA_SQL } from "./schema.js";
+
+// Fetch the runtime module via process.getBuiltinModule (node >=22.3): avoids static
+// resolution of `node:sqlite` by bundlers/vite (some tools' builtin lists don't yet
+// recognize this experimental module).
+const sqlite = process.getBuiltinModule("node:sqlite");
+
+/** Open (creating if necessary) the database: ensure the parent directory exists, set PRAGMAs, run table creation. */
+export function openDatabase(dbPath: string): DatabaseSync {
+  if (dbPath !== ":memory:") {
+    mkdirSync(path.dirname(dbPath), { recursive: true });
+  }
+  const db = new sqlite.DatabaseSync(dbPath);
+  db.exec("PRAGMA journal_mode = WAL;");
+  db.exec("PRAGMA foreign_keys = ON;");
+  db.exec(SCHEMA_SQL);
+  return db;
+}