fix: restore the deprecated issue_token aliases

Published 2.0.2 exposed ElydoraClient.issue_token(),
AsyncElydoraClient.issue_token(), and the IssueTokenResponse type alias.
The audit removed them, which breaks 2.0.x callers on a minor upgrade.
Restore all three, now raising DeprecationWarning.

Claude-Session: https://claude.ai/code/session_01Agoc9bRVE9KL7mmWtey9Vq

elydora/async_client.py

@@ -195,6 +195,15 @@ class AsyncElydoraClient:
             "POST", "/v1/auth/token", json_body=api_token_body(ttl_seconds)
         )
 
+    async def issue_token(self, ttl_seconds: Optional[int] = None) -> IssueApiTokenResponse:
+        """Deprecated alias for issue_api_token()."""
+        warnings.warn(
+            "AsyncElydoraClient.issue_token() is deprecated. Use issue_api_token().",
+            DeprecationWarning,
+            stacklevel=2,
+        )
+        return await self.issue_api_token(ttl_seconds=ttl_seconds)
+
     async def rotate_api_token(self) -> RotateApiTokenResponse:
         return await self._request("POST", "/v1/auth/rotate", json_body={})