Add SunLicense license checks to this project and prove they work. Do it all yourself: don't ask me anything. Where you must choose, pick a sensible default and list it at the end.

SunLicense checks license keys for software people sell. Docs for AI agents: https://docs.sunlicense.com/llms.txt

Rules:
- Never put a full license key or API key in source code, logs, commits or your messages. They live in the gitignored .env file that step 2 writes. In messages show keys masked (first 4 characters).
- Use the project's own shell. Windows: use PowerShell. If your sandbox blocks network access, ask for it once.
- Each step says what success looks like. If a step fails, read the error, fix the cause and retry; after two failed tries use the next option.
- Don't commit or push. Apart from the SunLicense CLI, install nothing outside the project: no system packages, language toolchains or package managers. If the SDK needs a package manager that isn't there, use the HTTP request from step 2 instead.

1. Get the SunLicense CLI. Use the first option that works; success: `sunlicense --version` prints a version.
   a. Already installed: `sunlicense --version`.
   b. macOS, Linux, WSL, Git Bash: `curl -fsSL https://sunlicense.com/install.sh | sh`
      Windows PowerShell: `irm https://sunlicense.com/install.ps1 | iex` (cmd: `powershell -c "irm https://sunlicense.com/install.ps1 | iex"`)
      If `sunlicense` isn't found afterwards, call it by the full path the installer printed.
   c. Node.js is installed: write `npx -y @sunlicense/cli@latest` wherever a step says `sunlicense`.
   d. Nothing can be installed or run: follow https://docs.sunlicense.com/guide/agent-setup.md instead of the CLI (the same steps as plain HTTPS calls), then continue at step 3.

2. In the project's root folder run `sunlicense init --json`.
   Success: JSON with "ok": true. It found or created a free account (a guest account when none is signed in), a product, an API key and one test license, and wrote SUNLICENSE_API_KEY and SUNLICENSE_LICENSE_KEY to the gitignored file in "envFile". Keep this JSON: the next steps use it.
   If "ok" is false with error.code "guest_limit" or "guest_unavailable": stop and tell me to sign up at https://app.sunlicense.com/signup and run `sunlicense login`, then paste this prompt again.
   If "ok" is false with error.code "plan_limit": my plan has no room for another product. Stop and pass on error.message (it names my products and the upgrade); don't pick a product for me.

3. Add the license check to the app, as "integration" in the JSON says:
   - "kind" "sdk": install the official SDK (integration.sdk.install) and adapt integration.sdk.code. "kind" "http", or an SDK that can't be installed or has no code to adapt: send the request in integration.http with the language's usual HTTP client.
   - Base URL: account.server. API key: the SUNLICENSE_API_KEY environment variable, loaded the way the project loads its settings.
   - License key: the customer's own, from the app's settings (config file, environment variable or a first-run prompt, whatever fits the app). During development it falls back to SUNLICENSE_LICENSE_KEY.
   - Check once at start-up. Rejected: show the reason and stop the paid features. SunLicense unreachable (network error or HTTP 5xx): keep working (fail open).
   - Follow integration.rules. Keep the change small and in the project's style. Success: the project builds.

4. Prove it with the test license. Run the app, or a short script or test that calls your check. License changes reach license checks within seconds: on an unexpected answer (such as NOT_FOUND right after step 2), retry every 5 seconds for up to 30 seconds before you change code.
   a. It reports the license as valid. `sunlicense validate --release` also prints VALID (--release keeps the CLI from using one of the test license's 2 machines).
   b. `sunlicense licenses suspend test@example.com --yes`, then run your check again. Success: rejected with SUSPENDED.
   c. `sunlicense licenses reinstate test@example.com`, then your check reports valid again.
   If a check gives the wrong answer, fix the code and repeat 4. Delete scripts you only made for this step; keep real tests.

5. Run `sunlicense mcp install` so I can manage licenses by asking you. Success: it names the file it wrote. If it prints a snippet instead, add it to your editor's MCP settings if you can, or put it in your last message. Web apps without a shell use the remote server https://api.sunlicense.com/mcp.

6. End with a short message to me (at most 20 lines):
   - What you changed (files) and the defaults you picked.
   - How to run the app with a license: where the customer's key goes.
   - How to issue, suspend and reinstate licenses: `sunlicense licenses issue`, `sunlicense licenses suspend <key>`, `sunlicense licenses reinstate <key>`, by asking you (MCP), or in the dashboard (`sunlicense open`).
   - "Run `sunlicense guide` for a short interactive tour on your test license."
   - If account.guest is true: "This is a guest account. It's deleted 30 days after it was last used: run `sunlicense claim` to keep it. Already have a SunLicense account? Run `sunlicense login`: everything moves into it, keys unchanged."
   - Pass on any "warnings" from step 2.
   - Set up over HTTP without the CLI (step 1d)? Then give the claim link (claimUrl) instead of `sunlicense claim`, the dashboard (it opens once the account is claimed) instead of the CLI commands, and the guest token once, to keep in a password manager.