Build Cobble project structure from the handoff

- Remove the preset document suite (letters, emails, invoices, quotes,
  PDF generation, line items) with its routes, API handlers and tables
- Rebrand to Cobble: site data, Lato, handoff design tokens (light and
  dark) in main.css, brand assets in public/brand, ember stone logo and
  regenerated favicons
- Add bots, bot_messages, bot_tasks and bot_task_steps tables, regenerate
  DB types (BUN_SQLITE_COBBLE_*) and add a sample crew seed (seed:bots)
- Add the chat shell at /admin/bots: rail with pinned coordinator and
  user popover, bottom-anchored conversation with composer, working-on
  panel, and a send-message API scoped to the session user
- Add BotStone and Wordmark components, crew status and relative time
  utils with tests, and update AGENTS.md

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

package.json

@@ -1,5 +1,5 @@
 {
-    "name": "bunext-sqlite-preset",
+    "name": "cobble",
     "module": "index.ts",
     "type": "module",
     "private": true,
@@ -11,6 +11,7 @@
         "db:admin": "bunx bun-sqlite admin",
         "db:backup": "bunx bun-sqlite backup",
         "seed": "bun src/scripts/seed-super-admin.tsx",
+        "seed:bots": "bun src/scripts/seed-bots.ts",
         "deploy:prod": "./deploy/deploy-prod.sh",
         "start": "NODE_ENV=production bun src/server.ts",
         "typecheck": "tsc --noEmit",