refactor(mir): Remove MetadataContext legacy fields (Phase 2-1/7)

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

## Changes
- Migrated all access sites to metadata_ctx.* (builder methods)
  - current_span → metadata_ctx.current_span() / set_current_span()
  - source_file → metadata_ctx.current_source_file() / set_source_file() / clear_source_file()
  - hint_sink → metadata_ctx.hint_scope_enter/leave/join_result()
  - current_region_stack → metadata_ctx.push_region/pop_region/current_region_stack()
- Removed 4 deprecated fields from MirBuilder
  - current_span, source_file, hint_sink, current_region_stack
- Removed 2 sync helpers
  - sync_metadata_ctx_to_legacy(), sync_legacy_to_metadata_ctx()
- Updated 10 files with direct field accesses

## Files Modified
- src/mir/builder.rs: -56 lines (fields + sync helpers + initialization)
- src/mir/builder/exprs.rs: metadata_ctx.set_current_span()
- src/mir/builder/exprs_peek.rs: metadata_ctx.current_span()
- src/mir/builder/if_form.rs: metadata_ctx.current_span()
- src/mir/builder/phi.rs: metadata_ctx.current_span()
- src/mir/builder/stmts.rs: metadata_ctx.set_current_span()
- src/mir/builder/utils.rs: metadata_ctx.current_span()
- src/mir/loop_api.rs: metadata_ctx.current_span()
- src/mir/region/observer.rs: metadata_ctx.push/pop_region()
- src/mir/utils/phi_helpers.rs: metadata_ctx.current_span()

## Tests
- cargo build --release: SUCCESS (1m 10s)
- cargo test --release --lib: 1029 PASS, 4 FAIL (pre-existing)
- Deprecation warnings: 469 → 435 (-34 warnings)

## Verification
✅ No direct access to removed fields (grep count: 0)
✅ No sync helper calls (grep count: 0)
✅ Build success
✅ MetadataContext is now complete SSOT (二重管理解消)

Phase 2 Progress: 1/7 contexts complete (MetadataContext ✅)

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

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

src/mir/builder/exprs.rs

@@ -9,7 +9,7 @@ impl super::MirBuilder {
     // Main expression dispatcher
     pub(super) fn build_expression_impl(&mut self, ast: ASTNode) -> Result<ValueId, String> {
         // Track current source span for downstream instruction emission
-        self.current_span = ast.span();
+        self.metadata_ctx.set_current_span(ast.span());
         if std::env::var("NYASH_LOOPFORM_DEBUG").is_ok() {
             if matches!(ast, ASTNode::Loop { .. }) {
                 eprintln!("[build_expression_impl] === ENTRY === processing Loop node");

src/mir/builder/exprs_peek.rs

@@ -124,7 +124,7 @@ impl super::MirBuilder {
                 cur_bb,
                 result_val,
                 phi_inputs,
-                self.current_span,
+                self.metadata_ctx.current_span(),
             );
         } else {
             self.emit_instruction(super::MirInstruction::Phi {

src/mir/builder/if_form.rs

@@ -30,7 +30,7 @@ impl<'a> PhiBuilderOps for ToplevelOps<'a> {
                 block,
                 dst,
                 inputs,
-                self.0.current_span,
+                self.0.metadata_ctx.current_span(),
             );
         } else {
             self.0.emit_instruction(MirInstruction::Phi {

src/mir/builder/phi.rs

@@ -85,7 +85,7 @@ impl MirBuilder {
                             cur_bb,
                             merged,
                             inputs,
-                            self.current_span,
+                            self.metadata_ctx.current_span(),
                         );
                     } else {
                         self.emit_instruction(MirInstruction::Phi {

src/mir/builder/stmts.rs

@@ -220,7 +220,7 @@ impl super::MirBuilder {
     /// - Expression としての If（値を使う）は build_expression 経由のまま
     pub(super) fn build_statement(&mut self, node: ASTNode) -> Result<ValueId, String> {
         // Align current_span to this statement node before lowering expressions under it.
-        self.current_span = node.span();
+        self.metadata_ctx.set_current_span(node.span());
         match node {
             // Phase 212.5: Statement としての If 処理
             ASTNode::If {

src/mir/builder/utils.rs

@@ -510,7 +510,7 @@ impl super::MirBuilder {
                 // Propagate effects on the block
                 block.insert_spanned_after_phis(SpannedInstruction {
                     inst: super::MirInstruction::Copy { dst, src },
-                    span: self.current_span,
+                    span: self.metadata_ctx.current_span(),
                 });
                 // Lightweight metadata propagation (unified)
                 crate::mir::builder::metadata::propagate::propagate(self, src, dst);