Add database package with Drizzle schema

Postgres schema via Drizzle ORM for agents, goals, issues, projects,
and activity log tables. Includes migration runner, seed script,
and Drizzle config.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

packages/db/src/seed.ts

@@ -0,0 +1,66 @@
+import { eq, inArray } from "drizzle-orm";
+import { createDb } from "./client.js";
+import { agents, projects, issues, goals } from "./schema/index.js";
+
+const url = process.env.DATABASE_URL;
+if (!url) throw new Error("DATABASE_URL is required");
+
+const db = createDb(url);
+
+console.log("Seeding database...");
+
+const [ceo, engineer, researcher] = await db
+  .insert(agents)
+  .values([
+    { name: "CEO Agent", role: "ceo", status: "active" },
+    { name: "Engineer Agent", role: "engineer", status: "idle" },
+    { name: "Researcher Agent", role: "researcher", status: "idle" },
+  ])
+  .returning();
+
+// Wire up reporting hierarchy: engineer and researcher report to CEO
+await db
+  .update(agents)
+  .set({ reportsTo: ceo!.id })
+  .where(inArray(agents.id, [engineer!.id, researcher!.id]));
+
+const [project] = await db
+  .insert(projects)
+  .values([{ name: "Paperclip MVP", description: "Build the initial paperclip management platform" }])
+  .returning();
+
+const [goal] = await db
+  .insert(goals)
+  .values([
+    {
+      title: "Launch MVP",
+      description: "Ship the minimum viable product",
+      level: "milestone",
+      ownerId: ceo!.id,
+    },
+  ])
+  .returning();
+
+await db.insert(issues).values([
+  {
+    title: "Set up database schema",
+    description: "Create initial Drizzle schema with all core tables",
+    status: "done",
+    priority: "high",
+    projectId: project!.id,
+    assigneeId: engineer!.id,
+    goalId: goal!.id,
+  },
+  {
+    title: "Implement agent heartbeat",
+    description: "Add periodic heartbeat mechanism for agent health monitoring",
+    status: "in_progress",
+    priority: "medium",
+    projectId: project!.id,
+    assigneeId: engineer!.id,
+    goalId: goal!.id,
+  },
+]);
+
+console.log("Seed complete");
+process.exit(0);