Fix LLVM print to output 42 instead of 4 (handle value) for field access.
Root cause: Type tags lost through MIR copy instruction chains
- getField tagged ValueId 16 as handle
- MIR copy chain: 16 → 17 → 18
- print used ValueId 18 (not tagged) → treated as raw integer
Solution: Type-tag based handle detection with copy propagation
- boxcall.py: Tag getField results as handles
- global_call.py: Skip boxing for handles in print
- copy.py: Propagate value_types tags through copy chains
Test coverage:
- apps/tests/phase285_print_raw_int.hako: Raw int regression check
- apps/tests/phase285_userbox_field_basic.hako: Field access parity
Result: VM/LLVM parity achieved (both output 42) ✅🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
Remove automatic WeakNew conversion and enforce strict compile-time type
checking for weak field assignments. Only 3 assignment types allowed:
1. Result of weak(x) call (WeakRef type)
2. Existing WeakRef variable (e.g., me.parent = other.parent)
3. Void/null (clear operation)
**Implementation**:
- Added MirType::WeakRef to type system (src/mir/types.rs)
- Track WeakRef type in emit_weak_new() even in pure mode
- Weak field reads return WeakRef without auto-upgrade
- Removed automatic WeakNew conversion from field writes
- Implemented check_weak_field_assignment() with actionable errors
- Fixed null literal type tracking (Phase 285A1.1: Unknown → Void)
**Testing**:
- 5 test fixtures (3 OK, 2 NG cases) - all passing
- Smoke test: phase285_weak_field_vm.sh
- Error messages guide users to use weak() or null
**Documentation**:
- Updated lifecycle.md SSOT with weak field contract
🤖 Generated with Claude Code
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
