refactor(mir): Remove TypeContext legacy fields (Phase 2-3/7)

完全移行→削除の安全順序（Option C）に従い、TypeContext の
deprecated フィールドと sync helpers を完全削除。

⚠️ 危険ゾーン: TypeFactsBox 等の同名フィールドと混同しないよう、
ファイル単位で手作業移行を実施。

## Changes
- Migrated all MirBuilder access sites to type_ctx.* (manual, 40+ files)
- Removed 3 deprecated fields (value_types, value_kinds, value_origin_newbox)
- Removed 2 sync helpers (sync_type_ctx_to_legacy, sync_legacy_to_type_ctx)
- Verified TypeFactsBox, CalleeGuardBox unchanged (no false positives)

## Tests
- cargo test --release --lib: 1029/1033 PASS
- TypeFactsBox integration: PASS (borrowed references unchanged)
- Deprecation warnings: 456 → 255 (-201, -44%)

## Safety Verification
✅ TypeFactsBox unchanged (still uses &'a BTreeMap borrowed references)
✅ CalleeGuardBox unchanged
✅ CalleeResolverBox unchanged
✅ BoxCompilationContext unchanged

Phase 2 Progress: 3/7 contexts complete (43%)
- ✅ MetadataContext
- ✅ CoreContext
- ✅ TypeContext (this commit)

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

src/mir/builder/control_flow/joinir/merge/loop_header_phi_builder.rs

@@ -95,8 +95,8 @@ impl LoopHeaderPhiBuilder {
 
         // Phase 131-11-H: Set PHI type from entry incoming (init value) only
         // Ignore backedge to avoid circular dependency in type inference
-        if let Some(init_type) = builder.value_types.get(&loop_var_init).cloned() {
-            builder.value_types.insert(loop_var_phi_dst, init_type.clone());
+        if let Some(init_type) = builder.type_ctx.value_types.get(&loop_var_init).cloned() {
+            builder.type_ctx.value_types.insert(loop_var_phi_dst, init_type.clone());
 
             if debug || std::env::var("NYASH_CARRIER_PHI_DEBUG").ok().as_deref() == Some("1") {
                 eprintln!(
@@ -144,8 +144,8 @@ impl LoopHeaderPhiBuilder {
 
             // Phase 131-11-H: Set PHI type from entry incoming (init value) only
             // Ignore backedge to avoid circular dependency in type inference
-            if let Some(init_type) = builder.value_types.get(&init_value).cloned() {
-                builder.value_types.insert(phi_dst, init_type.clone());
+            if let Some(init_type) = builder.type_ctx.value_types.get(&init_value).cloned() {
+                builder.type_ctx.value_types.insert(phi_dst, init_type.clone());
 
                 if debug || std::env::var("NYASH_CARRIER_PHI_DEBUG").ok().as_deref() == Some("1") {
                     eprintln!(