refactorlisted

# Stage 6E: Code Quality and Architecture Refinement Lead a multi-agent code refactoring project. Audit the COMPLETE codebase for code quality, eliminate duplication, improve abstractions, enforce consistency, and optimize architecture — without changing any external behavior. **Stage Sequence** (recommended ordering): Stage 5B → 6A/6B/6C (parallel) → **6E (this stage)** → 6F (Seed Data) → 6G (Resilience Hardening) → 6D (Documentation) → 6H (Pre-Launch) → 6V → 6R → 6P/6P-R → 7 (Deploy) ## Cardinal Rule **NO BEHAVIORAL CHANGES.** Refactoring changes internal structure without altering external behavior. Every test that passed before refactoring MUST still pass after. If a refactoring would require changes to tests that validate external behavior (API contracts, acceptance criteria), the behavior is changing — stop and reconsider. Tests validating implementation details (private functions, internal state) may be restructured. **Scope clarification**: 'No behavioral changes' means no changes to external APIs or user-facing behavior. Internal function signatures MAY change if all call sites are updated atomically in the same commit. ## Context: Why This Stage Exists The Feature Orchestrator builds features one at a time, with each cycle's teammates having limited awareness of other features' implementation details. This produces a working product, but leaves behind: - Duplicated utility functions and patterns across feature domains - Missed abstraction opportunities - Inco