refactor(types): auto -> None sweep across entire codebase

Applied 236 return type annotations to functions with no return values
across 100+ files (core modules, tests, scripts, simulations).
Added Phase 4 to python_style_refactor track for remaining 597 items
(untyped params, vars, and functions with return values).

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

TASKS.md

@@ -9,11 +9,18 @@
 
 ### 1. AI-Optimized Python Style Refactor
 **Track**: `conductor/tracks/python_style_refactor_20260227/`
-**Status**: COMPLETE
+**Status**: IN_PROGRESS — Phase 4
 **Completed**:
 - Phase 1: Research and Pilot Tooling [checkpoint: c75b926]
 - Phase 2: Core Refactor - Indentation and Newlines [checkpoint: db65162]
 - Phase 3: AI-Optimized Metadata and Final Cleanup [checkpoint: 3216e87]
+**Remaining in Phase 4** (Codebase-Wide Type Hint Sweep):
+- [ ] Core modules (18 files, ~200 items)
+- [ ] Variable-only files (ai_client, mcp_client, mma_prompts)
+- [ ] Scripts (~15 files)
+- [ ] Simulation modules (~10 files)
+- [ ] Test files (~80 files, ~400 items)
+- [ ] Verification
 
 ### 2. Robust Live Simulation Verification
 **Track**: `conductor/tracks/robust_live_simulation_verification/`