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[MEMORY] User wants deterministic IRC-bot-style command dispatch in nanobot where `!command text` invokes a registered Python function or external app and returns output without LLM agent involvement [MEMORY] User expects nanobot creators to implement custom command registration natively and considers existing workaround solutions unsatisfactory [MEMORY] User requested patch study only with no actual code changes for nanobot IRC-bot command dispatch feature [MEMORY] Nanobot CommandRouter has priority/exact/prefix/interceptor tiers but lacks an extension point for custom command registration with all handlers hardcoded in builtin.py [MEMORY] Proposed nanobot patch adds a custom command tier to CommandRouter dispatching before session lock configured via `commands` section in config.json supporting exec script and python module/function handler types