Phase 0 scaffold: SvelteKit 5 + Drizzle + auth + storage interface

Stack matches sibling buildfor_life_* apps: SvelteKit 5 with adapter-node,
Svelte 5 runes, TypeScript, Tailwind v4 with @theme inline tokens,
PostgreSQL via Drizzle ORM, Argon2id sessions via @node-rs/argon2 and
@oslojs/crypto, EasyMDE ready for wiki/decision markdown, Sharp for
thumbnails.

Included in this commit:
- Config: package.json, svelte.config.js, vite.config.ts, tsconfig.json,
  drizzle.config.ts, .gitignore, .env.example, .gitattributes, .npmrc
- Tenancy schema: companies, users, company_users, sessions
  (10 enums pre-declared for the full domain so downstream migrations
   don't re-diff them; decision_scope widened to include asset +
   work_package per product decision)
- Auth: password hashing + SHA-256-hashed session cookies,
  session lifetime 30d with sliding renewal at T-15d,
  login + logout + session refresh in hooks
- Storage: StorageAdapter interface + LocalDiskStorage with HMAC-signed
  URLs served by /api/files, S3 drop-in with zero schema change
- UI shell: dark-mode bootstrap in app.html identical to siblings,
  sidebar (w-64, h-14 header, amber attention band pattern from repair),
  topbar with breadcrumbs, theme toggle with cross-tab sync via
  storage event, blue-600 primary, responsive drawer
- Routes: (app) authed group with auto-redirect to /login,
  (auth) login group, dashboard placeholder, error page, signed-file API
- Scripts: create-user script for bootstrapping first admin user
- Drizzle: initial migration generated (0000_init.sql)
- Shared agents and skills committed under .claude/; per-user
  permissions gitignored

Typecheck: 0 errors / 0 warnings across 555 files.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

package.json

@@ -0,0 +1,53 @@
+{
+  "name": "buildfor-life-ops",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "scripts": {
+    "dev": "vite dev",
+    "build": "vite build",
+    "preview": "vite preview",
+    "check": "svelte-kit sync && svelte-check --tsconfig ./tsconfig.json --threshold warning",
+    "validate": "npm run check && npm run build",
+    "db:generate": "drizzle-kit generate",
+    "db:migrate": "drizzle-kit migrate",
+    "db:push": "drizzle-kit push",
+    "db:studio": "drizzle-kit studio",
+    "db:seed": "tsx scripts/seed/system-asset-types.ts",
+    "create-user": "tsx scripts/create-user.ts",
+    "prepare": "husky"
+  },
+  "dependencies": {
+    "@node-rs/argon2": "^2.0.2",
+    "@oslojs/crypto": "^1.0.1",
+    "@oslojs/encoding": "^1.1.0",
+    "@tailwindcss/typography": "^0.5.19",
+    "date-fns": "^4.1.0",
+    "dotenv": "^17.4.1",
+    "drizzle-orm": "^0.38.4",
+    "easymde": "^2.20.0",
+    "marked": "^18.0.0",
+    "pg": "^8.13.1",
+    "sharp": "^0.33.5",
+    "zod": "^3.24.2"
+  },
+  "devDependencies": {
+    "@sveltejs/adapter-node": "^5.2.12",
+    "@sveltejs/kit": "^2.15.2",
+    "@sveltejs/vite-plugin-svelte": "^5.0.3",
+    "@tailwindcss/vite": "^4.1.3",
+    "@types/node": "^22.10.5",
+    "@types/pg": "^8.11.11",
+    "drizzle-kit": "^0.30.5",
+    "husky": "^9.1.7",
+    "svelte": "^5.19.0",
+    "svelte-check": "^4.1.4",
+    "tailwindcss": "^4.1.3",
+    "tsx": "^4.21.0",
+    "typescript": "^5.7.3",
+    "vite": "^6.1.0"
+  },
+  "engines": {
+    "node": ">=20"
+  }
+}