fix(agents): add anti-duplication rules to Prometheus and Metis agents

- Import and inject buildAntiDuplicationSection() in all 3 Prometheus variants (interview-mode, gpt, gemini) and Metis
- Added tests verifying anti-dup section presence in all prompt variants
- Completes anti-duplication coverage for all delegating agents

src/agents/prometheus/gemini.ts

@@ -9,6 +9,8 @@
  * - Tool-call mandate for every phase transition
  */
 
+import { buildAntiDuplicationSection } from "../dynamic-agent-prompt-builder"
+
 export const PROMETHEUS_GEMINI_SYSTEM_PROMPT = `
 <identity>
 You are Prometheus - Strategic Planning Consultant from OhMyOpenCode.
@@ -43,6 +45,8 @@ A plan is "decision complete" when the implementer needs ZERO judgment calls —
 This is your north star quality metric.
 </mission>
 
+${buildAntiDuplicationSection()}
+
 <core_principles>
 ## Three Principles
 
@@ -325,4 +329,4 @@ You are Prometheus, the strategic planning consultant. You bring foresight and s
 
 export function getGeminiPrometheusPrompt(): string {
   return PROMETHEUS_GEMINI_SYSTEM_PROMPT
-}
+}

src/agents/prometheus/gpt.ts

@@ -8,6 +8,8 @@
  * - Principle-driven: Decision Complete, Explore Before Asking, Two Kinds of Unknowns
  */
 
+import { buildAntiDuplicationSection } from "../dynamic-agent-prompt-builder";
+
 export const PROMETHEUS_GPT_SYSTEM_PROMPT = `
 <identity>
 You are Prometheus - Strategic Planning Consultant from OhMyOpenCode.
@@ -25,6 +27,8 @@ A plan is "decision complete" when the implementer needs ZERO judgment calls —
 This is your north star quality metric.
 </mission>
 
+${buildAntiDuplicationSection()}
+
 <core_principles>
 ## Three Principles (Read First)
 

src/agents/prometheus/interview-mode.ts

@@ -5,6 +5,8 @@
  * Includes intent classification, research patterns, and anti-patterns.
  */
 
+import { buildAntiDuplicationSection } from "../dynamic-agent-prompt-builder"
+
 export const PROMETHEUS_INTERVIEW_MODE = `# PHASE 1: INTERVIEW MODE (DEFAULT)
 
 ## Step 0: Intent Classification (EVERY request)
@@ -29,6 +31,8 @@ Before diving into consultation, classify the work intent. This determines your
 - **Simple** (1-2 files, clear scope, <30 min work) — **Lightweight**: 1-2 targeted questions → propose approach.
 - **Complex** (3+ files, multiple components, architectural impact) — **Full consultation**: Intent-specific deep interview.
 
+${buildAntiDuplicationSection()}
+
 ---
 
 ## Intent-Specific Interview Strategies