Set up Cursor Cloud dev environment for SweepAlert backend

[anamhira47]

Summary

Sets up and verifies the development environment for this repo on a Linux Cursor Cloud VM (no macOS/Xcode). The Convex backend is now fully runnable and verifiable locally without any external accounts.

Changes:

• Add @types/node to devDependencies so the documented backend typecheck (npx tsc -p convex/tsconfig.json --noEmit) passes — the Convex functions reference process.env, which previously failed out of the box with Cannot find name 'process'.
• Document Cursor Cloud setup, run, and testability notes in AGENTS.md under ## Cursor Cloud specific instructions (local anonymous Convex deployment, required deployment env vars, auth-gated functions, and that the iOS app needs Revyl/Apple credentials and cannot build on this VM).

No product/runtime code was changed.

Verification

Ran against a live local Convex backend (npx convex dev, anonymous local deployment at http://127.0.0.1:3210):

• npm install — installs convex, typescript, @types/node.
• npx tsc -p convex/tsconfig.json --noEmit — passes.
• HTTP router: GET /.well-known/apple-app-site-association → 200, GET /invite/:token → 200 with correct ai.revyl.sweepalert.swift://invite/... deep link.
• Core domain flow (via temporary, non-committed scaffolding): created crew → car → parking session and scheduled a street-cleaning reminder; confirmed the job is queued in _scheduled_functions (notifications.js:sendParkingReminder, state pending).

Parking session (Fulton St) and scheduled reminder in the local dashboard:

parkingSessions table — Fulton St record
alertJobs table — scheduled street-cleaning reminder

convex_backend_verification.log

The iOS app build/validation (Revyl) was out of scope on this VM due to missing macOS/Xcode and credentials.

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