chore: Update docs/private submodule (Phase 41-3 design)
Phase 41-3 complete: JoinIR extension design for nested if - NestedIfMerge JoinInst variant - Stack-based PHI generation algorithm - Implementation roadmap (41-3a/3b/4) 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude <noreply@anthropic.com>
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