refactor(prompt): dedupe repeated skill guidance blocks

src/agents/dynamic-agent-prompt-builder.ts

@@ -167,7 +167,6 @@ export function formatCustomSkillsBlock(
   customSkills: AvailableSkill[],
   headerLevel: "####" | "**" = "####"
 ): string {
-  const customSkillNames = customSkills.map((s) => `"${s.name}"`).join(", ")
   const header = headerLevel === "####"
     ? `#### User-Installed Skills (HIGH PRIORITY)`
     : `**User-Installed Skills (HIGH PRIORITY):**`
@@ -180,7 +179,7 @@ Subagents are STATELESS — they lose all custom knowledge unless you pass these
 ${customRows.join("\n")}
 
 > **CRITICAL**: Ignoring user-installed skills when they match the task domain is a failure.
-> The user installed ${customSkillNames} for a reason — USE THEM when the task overlaps with their domain.`
+> The user installed custom skills for a reason — USE THEM when the task overlaps with their domain.`
 }
 
 export function buildCategorySkillsDelegationGuide(categories: AvailableCategory[], skills: AvailableSkill[]): string {