Fix plugin crypto API method name mismatch in runtime bridge

[Copilot]

This PR addresses the review-thread issue where the plugin runtime called a non-existent crypto host API method. The runtime now uses the method name expected by the protocol/host dispatch so plugin crypto calls are routed correctly.

• Runtime API alignment

  • Updated the plugin sandbox runtime host call from crypto.fetchPublicKeys to crypto.getPublicKeys to match the allowed/implemented host API surface.

• Behavioral impact

  • Prevents valid plugin calls from being rejected as unknown methods due to naming mismatch.
  • Restores compatibility between runtime bridge calls and host-side method dispatch.

// before
callApi('crypto.fetchPublicKeys', args)

// after
callApi('crypto.getPublicKeys', args)

[Copilot]

Copilot wasn't able to review any files in this pull request.

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.