perf: enhance developing-cast and streaming-cast skill documentatio…

[qjrm1430]

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📝 Summary

Bot Issue Fix

enhance developing-cast and streaming-cast skill documentation by improving defensive programming in the list_reducer function and clarifying content handling in event generation. Refactor multiple modes dispatch pattern for better streaming semantics. Bump version to 2026.05.26.

[gemini-code-assist]

Code Review

This pull request improves the robustness of state reduction and streaming patterns in the scaffold templates. Specifically, it handles defensive state initialization in list_reducer and fixes a syntax error in the dispatch pattern where unpacking async generators with * was incorrectly attempted. Feedback is provided regarding the serialization of tool outputs in integration.md; using str(call.output) on structured objects (like dictionaries or lists) yields Python-specific single-quoted representations that are invalid JSON. It is recommended to use json.dumps or pass the raw object directly to the JSON serializer.