docs(mux-loop): add multi-agent architecture consensus & review reports for CLI redesign

.agents/reports/planner-reviewer-claude-01/report-a3e2d137.md

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+# 📋 Review & Verdict on Grok's Rev.4 Consensus Document (Job a3e2d137)
+
+- **Reviewer**: planner-reviewer-claude-01
+- **Job ID**: a3e2d137
+- **Role**: Planner & Reviewer
+- **Target**: Grok's Rev.4 Consensus (Complete Removal of `--target-agent` in favor of pure `--creator`)
+
+---
+
+## 1. Executive Summary & Verdict
+- **Verdict**: **STRONGLY ENDORSED (100% PASS)**
+- **Rationale**: Completely eliminating `--target-agent` in favor of pure `--creator` is the cleanest possible architectural decision. It adheres strictly to AGENTS.md Simplicity First ("No abstractions for single-use code", "No flexibility that wasn't requested").
+
+---
+
+## 2. Reviewer Detailed Evaluation
+
+1. **Trade-Off Analysis**:
+   - Keeping the alias created an enormous maintenance burden (dual variable parsing, conflict matrix, duplicate error messages, 40+ lines of defensive boilerplate) just to avoid updating 4 in-repo call sites.
+   - Dropping `--target-agent` and migrating the 4 in-repo sites in the same commit reduces parser complexity by ~80% and eliminates entire classes of potential bugs.
+
+2. **Helpful Explicit Error**:
+   - Adding a dedicated fail-fast error (`ERROR: --target-agent was removed. Use --creator <session> instead.`) prevents user confusion without carrying the burden of legacy execution.
+
+3. **Checklist & Implementation Blueprint Completeness**:
+   - The Section 5 checklist in Rev.4 is crisp, deterministic, and 100% ready for physical code implementation.
+
+[VERDICT: PASS]