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/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 {