A permission request counted as an MCP tool call whenever its title
looked like `<server>_<tool>`, whatever its kind, and acp_permits
allowed MCP calls before looking at the kind. So an `execute` request
titled e.g. `hyperhive_x`, or a `fetch` without web_tools, was allowed.
MCP tool calls come with kind `other` (opencode's toToolKind maps every
tool it doesn't name, MCP tools included, to "other"). The runtime now
sets PermissionAsk::mcp_server only for kind `other`, and acp_permits
allows an MCP server's tool only under the `other` arm.
Refs #4391
bed72ce280