add diagnostic log for passkey get assertions to surface any handler-side issues

@@ -459,21 +459,33 @@459459     lastUsedAt: Date.now(),460460   });461461 462+  const responseJson = JSON.stringify({463+    id: match.credentialId,464+    rawId: match.credentialId,465+    type: "public-key",466+    response: {467+      clientDataJSON: base64urlEncode(clientDataJSON),468+      authenticatorData: base64urlEncode(authData),469+      signature: base64urlEncode(signature),470+      userHandle: match.userHandle,471+    },472+    authenticatorAttachment: "platform",473+    clientExtensionResults: {},474+  });475+476+  console.log("[Peach passkey] completing get assertion", {477+    rpId: match.rpId,478+    credentialId: match.credentialId,479+    algorithm: match.algorithm,480+    signCount: nextSignCount,481+    flags: flags.toString(16),482+    signatureBytes: signature.length,483+    userHandle: match.userHandle,484+  });485+462486   await chrome.webAuthenticationProxy.completeGetRequest({463487     requestId: request.requestId,464-    responseJson: JSON.stringify({465-      id: match.credentialId,466-      rawId: match.credentialId,467-      type: "public-key",468-      response: {469-        clientDataJSON: base64urlEncode(clientDataJSON),470-        authenticatorData: base64urlEncode(authData),471-        signature: base64urlEncode(signature),472-        userHandle: match.userHandle,473-      },474-      authenticatorAttachment: "platform",475-      clientExtensionResults: {},476-    }),488+    responseJson,477489   });478490 }479491