fix(delegate-task): use exact match for isPlanFamily to allow Metis/Momus

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

src/tools/delegate-task/constants.ts

@@ -325,7 +325,7 @@ export const PLAN_AGENT_NAMES = ["plan"]
 export function isPlanAgent(agentName: string | undefined): boolean {
   if (!agentName) return false
   const lowerName = agentName.toLowerCase().trim()
-  return PLAN_AGENT_NAMES.some(name => lowerName === name || lowerName.includes(name))
+  return PLAN_AGENT_NAMES.some(name => lowerName === name)
 }
 
 /**
@@ -342,7 +342,5 @@ export function isPlanFamily(category: string | undefined): boolean
 export function isPlanFamily(category: string | undefined): boolean {
   if (!category) return false
   const lowerCategory = category.toLowerCase().trim()
-  return PLAN_FAMILY_NAMES.some(
-    (name) => lowerCategory === name || lowerCategory.includes(name)
-  )
+  return PLAN_FAMILY_NAMES.some((name) => lowerCategory === name)
 }