Add ENS reverse lookup endpoint and Claim prefill after SIWE

[GsCommand]

Motivation

• Improve the Claim flow by detecting a wallet's primary ENS name after SIWE authentication so the ENS/tenant step can be prefilled and the user can opt-in to use it.
• Provide a simple backend lookup endpoint to perform ENS reverse resolution using an RPC provider configured via environment variables.
• Keep privacy and scope tight by only checking ENS identity and not performing ownership verification, token scans, provisioning, payment, or ERC-8004 registration.

Description

• Added GET /api/ens/lookup?address=0x... at api/ens/lookup.js which validates the request, accepts ETH_RPC_URL or BASE_RPC_URL, performs a reverse lookup with ethers when available, and returns { ok, address, primaryName|null, source: 'reverse_resolution' } or structured errors including PROVIDER_UNAVAILABLE when no RPC is configured.
• Updated public/claim.html to call the lookup after successful SIWE authentication, display status copy, show Primary ENS detected: name.eth with a Use this ENS name button when found, and provide clear privacy wording that only ENS identity is checked.
• Implemented UI behavior and field changes for Step 3: CommandLayer mode suggests a tenant label derived from the primary ENS (stripping .eth), Your ENS and Single agent modes prefill the ENS name, and users may always manually override the input.
• Added server-side tests at tests/api-ens-lookup.test.js covering missing address, invalid address, and provider-missing behavior, and made the ENS lookup handler tolerant when the ethers dependency is not present (returns DEPENDENCY_UNAVAILABLE).

Testing

• Ran npm install and npm test at repo root, and all tests passed (34/34).
• Ran npm install and npm run check in examples/webhook-auto-verify which completed successfully.
• npm run build is not present in this repository and therefore was not run.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
commandlayer-commandlayer-org	Ready	Preview, Comment	May 22, 2026 3:47am
commandlayer-org	Ready	Preview, Comment	May 22, 2026 3:47am
commandlayer-org111	Ready	Preview, Comment	May 22, 2026 3:47am