docs: Phase 40-4.2 documentation finalization
- CURRENT_TASK.md: Add Phase 40-4.1 section with deletion results - docs/private submodule: Update all Phase 40 documentation Phase 40 status: "Level 2 first deletion complete (51 lines), remaining items await JoinIrConservativeAnalyzer implementation" 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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