Add workspaces, computers, bot memory and the bots queue

- Schema: workspaces (+ workspace_bots, workspace_computers), containers,
  computers, bot_computers, bots.memory, workspaces.system_prompt, and
  bots_queue as a bun-sqlite isQueue table
- Main computer (and its container record) ensured with the coordinator on
  signup, seed and /admin/bots; the coordinator's access to it is locked
- Effective computer access: direct grants plus workspace computers
- Full bot prompt: core instructions, workspace prompts, then memory;
  bots can rewrite their memory and system prompt
- Queue helpers on the native BunSQLite.queue API, plus a handler that
  heartbeats, serializes per computer, recovers after restarts, reports
  lost jobs, supports cancelling and pushes outcomes over the WebSocket
- Enable SQLite foreign keys at startup so schema cascades fire
- Prune finished jobs daily

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/utils/assert-prompt-length.test.ts

@@ -0,0 +1,24 @@
+import { describe, expect, test } from "bun:test";
+import { AppData } from "@/src/data/app-data";
+import assertPromptLength from "./assert-prompt-length";
+
+describe("assertPromptLength", () => {
+    test("allows text up to the cap", () => {
+        expect(() =>
+            assertPromptLength({
+                label: "Memory",
+                text: "a".repeat(AppData.PromptMaxLength),
+            }),
+        ).not.toThrow();
+        expect(() => assertPromptLength({ label: "Memory" })).not.toThrow();
+    });
+
+    test("rejects text over the cap", () => {
+        expect(() =>
+            assertPromptLength({
+                label: "Memory",
+                text: "a".repeat(AppData.PromptMaxLength + 1),
+            }),
+        ).toThrow("Memory is too long");
+    });
+});