IntentCall migration — MCPCallEntry → AgentCallEntry

MCPCallEntry is removed from mcp_toolkit. App code must use AgentCallEntry (from intentcall_core, re-exported by mcp_toolkit).

Canonical migration doc: migration_mcp_call_entry_to_agent_call_entry.md

When to use this skill

• dart analyze reports undefined MCPCallEntry after upgrading mcp_toolkit
• User asks to migrate custom tools/resources to the new API
• Before shipping a major mcp_toolkit bump to consumers

CLI (preferred)