fix(auth): validate verify payload before SIWE import

[GsCommand]

Motivation

• Prevent invalid or malformed requests from triggering a 503 by ensuring basic request validation happens before attempting to load or use the siwe dependency.
• Make /api/auth/verify return 400 for missing/incorrect payload shapes and non-string message/signature inputs prior to SIWE parsing.
• Preserve cryptographic SIWE verification and existing domain/URI/chain/statement checks so authentication remains strict.

Description

• Add explicit request-shape validation in api/auth/verify.js to reject non-object bodies, missing message/signature, and non-string types with 400 errors.
• Move the require('siwe') usage to after these basic validations so the SIWE dependency is only loaded for complete-looking requests, and return a 503 (dependency_unavailable) if it cannot be imported.
• Keep all SIWE parsing, domain/URI/chain/statement checks, and parsed.verify(...) cryptographic verification unchanged so AUTHENTICATED is only returned on successful verification.
• Update tests/api-auth.test.js to assert 400 for missing message and malformed request body and to tolerate dependency_unavailable when SIWE is absent for malformed SIWE payload tests.

Testing

• Ran npm test (executes node --test tests/*.test.js) and all tests passed (56 passed, 0 failed), including the previously failing auth test.
• Ran npm run check in examples/webhook-auto-verify and it passed.

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Codex Task

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Project	Deployment	Actions	Updated (UTC)
commandlayer-commandlayer-org	Ready	Preview, Comment	May 22, 2026 10:35pm
commandlayer-org	Ready	Preview, Comment	May 22, 2026 10:35pm
commandlayer-org111	Ready	Preview, Comment	May 22, 2026 10:35pm