a3bfba809f
Remove Rune's vestigial built-in $rune.search/$rune.describe (which only saw effect-Schema Definitions, never our dynamic MCP tools) and the reserved-namespace guard. Move our ranked search and typed describe under tools.$rune.* — the runtime's own namespace, separate from MCP server namespaces and collision-proof since $ never appears in a sanitized server name. One discovery implementation, no dead code.