- Kill agentConfig struct. run() takes (*Runtime, TurnCtx, state) directly.
TurnCtx holds only 7 per-turn closures; stable config reads come from Runtime.
- Lazy tool refresh: toolsNeedRefresh() checks ToolRegistryRevision() on the
tool server. Skips ListTools IPC when registry hasn't changed. Remote Conn
falls back to always-refetch (same as before).
- AgentConfig.GenParams() method replaces the 16-line manual field copy in
BuildRuntime.
- Remove CfgBackend/CfgModel from Runtime. Callers read cfg.Backend/cfg.Model
directly since they already have the AgentConfig in scope.
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