feat: delegate credential loading to protect-ffi

[coderdan]

Summary

• Remove eager workspace CRN checks from ProtectClient and EncryptionClient constructors. Credential resolution (workspace CRN, access key, client key) is now fully handled by protect-ffi via stack-auth and the ~/.cipherstash profile — no env vars or cipherstash.toml required.
• Use ensureKeyset from protect-ffi in keyset tests instead of hardcoded UUIDs, so tests create/find the keyset dynamically.
• Upgrade EQL to 2.2.1 in the local Docker setup.

Dependency

This PR depends on a new version of @cipherstash/protect-ffi which has not yet been published. The pnpm override in package.json currently points to a local link. Before merging, protect-ffi must be published and the override replaced with the published version.

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