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get_issue raised 'NoneType' object is not iterable on issues whose labels/assignees Gitea returns as null or with non-dict elements (the #13 class), which reached clients as an opaque JSON-RPC -32603 with no detail. - read_tools: skip non-dict label/assignee entries in get_issue_tool - server: detect a wrapped GiteaNotFoundError via the __cause__ chain and return 404 / JSON-RPC -32000 with a clear message; include the exception type name in masked internal errors so future masked failures are diagnosable without exposing messages or stack traces - tests: cover non-dict collection elements and the not-found / typed-error responses - ci: rewrite docker.yml to build, smoke-test and push the image to the Gitea container registry on merge to main/dev, matching the hiddenden.cafe pattern (only REGISTRY_TOKEN required) Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>