Add tools() and onToolsChanged() to the MCPClient.Connection abstraction:
list is capability-gated, paginated with cursor-dedup, and tolerates
unresolvable outputSchemas via a per-page fallback. Tool listing is folded
into connect so a listing failure marks the server failed rather than leaving
it connected with a silently empty list. Cache MCP.Tool values per server,
refresh on tools/list_changed notifications, and publish McpEvent.ToolsChanged.
MCP.tools() aggregates the cached tools across all connected servers.
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