nyash-codex
7235fe62e9
refactor(mir): Remove ScopeContext legacy fields (Phase 2-4/7)
完全移行→削除の安全順序（Option C）に従い、ScopeContextの
deprecated フィールドと sync helpers を完全削除。
## Changes
- Migrated all access sites to scope_ctx.*
- Removed 7 deprecated fields:
- current_function
- lexical_scope_stack
- function_param_names
- loop_header_stack
- loop_exit_stack
- if_merge_stack
- debug_scope_stack
- Removed 2 sync helpers (sync_scope_ctx_to_legacy, sync_legacy_to_scope_ctx)
- Updated 20+ files with direct field access
## Tests
- cargo build --release: PASS ✅
- Deprecation warnings: 255 → 166 (-89, -35%)
Phase 2 Progress: 4/7 contexts complete (57%)