feat(joinir): Phase 225 - MethodCall init meta-driven lowering

- Remove hardcoded method whitelist from loop_body_local_init.rs
- Remove hardcoded box name matching
- Delegate to MethodCallLowerer for all MethodCall handling
- CoreMethodId metadata is now SSOT for init method validation
- substring now works in body-local init (-82 net lines)

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

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

src/mir/builder/control_flow/joinir/patterns/pattern4_carrier_analyzer.rs

@@ -290,6 +290,7 @@ mod tests {
             ],
             trim_helper: None,
             promoted_loopbodylocals: Vec::new(), // Phase 224
+            condition_aliases: Vec::new(), // Phase 224-D
         };
 
         // Analyze carriers

src/mir/builder/control_flow/joinir/patterns/pattern_pipeline.rs

@@ -405,6 +405,7 @@ mod tests {
                 ],
                 trim_helper: None,
                 promoted_loopbodylocals: Vec::new(), // Phase 224
+                condition_aliases: Vec::new(), // Phase 224-D
             },
             loop_scope: LoopScopeShapeBuilder::empty_body_locals(
                 BasicBlockId(0),
@@ -444,6 +445,7 @@ mod tests {
                     whitespace_chars: vec![" ".to_string(), "\t".to_string()],
                 }),
                 promoted_loopbodylocals: Vec::new(), // Phase 224
+                condition_aliases: Vec::new(), // Phase 224-D
             },
             loop_scope: LoopScopeShapeBuilder::empty_body_locals(
                 BasicBlockId(0),