[NOT-561] Add Tilion (beta) cloud browser provider

[arham766]

Adds Tilion (tilion.dev) as a cloud browser provider. We're in beta.

Following CONTRIBUTING.md:

• src/providers/tilion.ts — implements ProviderClient: create() returns { id, cdpUrl } (our API returns an authenticated CDP url inline), release(id) tears the session down, and computeCost(seconds) uses our $0.03/hr list rate. Sessions are created non-stealth with direct egress, to match how the other providers are benchmarked.
• src/types.ts — adds TILION to the ProviderName union. Required, otherwise the provider's name field doesn't typecheck and the build fails.
• src/providers/index.ts — registers the provider and its required env var.
• .env.example — documents TILION_API_KEY and TILION_BASE_URL.
• README.md — adds the providers table row.

The optional recording hooks (startRecording / stopRecording / downloadRecording) are deliberately not implemented. They're optional in ProviderClient and the runner feature-detects them, so defining them to throw would be worse than omitting them — a defined method is truthy, so the runner would call it and take the exception. Omitted, recording is skipped cleanly.

npm run build passes in both the root and web/.

Getting a key to run it

You'll need a TILION_API_KEY to benchmark us, and we'd rather not make you chase it — tell us where to send one and we'll issue a key with credits pre-loaded, scoped purely to benchmarking so there's no signup friction on your side. Happy to do that via an issue, a DM, or whatever you prefer.

Verify

npm run dev -- --provider=tilion --runs=10

Happy to make any changes you'd like — naming, cost model, or the session options we pass.

Linear: NOT-561 https://linear.app/nottelabsinc/issue/NOT-561/browserarena-pr-32-add-tilion-beta-cloud-browser-provider

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[arham766]

Hey @giordano-lucas, if you can kindly review this, that would be great. As it's in beta, I would be very happy to provide you with the api key. We are really looking forward to being in this Agentic browser infra community.

[andreakiro]

Hey @arham766 thanks for opening this PR and excited to see someone new in the space! Send me an email with the API key details, etc. Here's my email: andrea@notte.cc Thanks

[arham766]

Thanks for the reply, @andreakiro, sent you the api key with few details.

[arham766]

Hey @andreakiro, if it's possible for you to run the test today, that would be great.

Best,
Arham