feat(joinir): Phase 213-2 Step 2-2 & 2-3 Data structure extensions

Extended PatternPipelineContext and CarrierUpdateInfo for Pattern 3 AST-based generalization.

Changes:
1. PatternPipelineContext:
   - Added loop_condition: Option<ASTNode>
   - Added loop_body: Option<Vec<ASTNode>>
   - Added loop_update_summary: Option<LoopUpdateSummary>
   - Updated build_pattern_context() for Pattern 3

2. CarrierUpdateInfo:
   - Added then_expr: Option<ASTNode>
   - Added else_expr: Option<ASTNode>
   - Updated analyze_loop_updates() with None defaults

Status: Phase 213-2 Steps 2-2 & 2-3 complete
Next: Create Pattern3IfAnalyzer to extract if statement and populate update summary

docs/guides/wasm-guide/README.md

@@ -18,10 +18,10 @@ Nyash WebAssembly（WASM）実行に関する包括的ガイド
 ### WASM コンパイル
 ```bash
 # 基本コンパイル
-./target/release/nyash --compile-wasm program.hako
+./target/release/hakorune --compile-wasm program.hako
 
 # AOT コンパイル（配布用）
-./target/release/nyash --aot program.hako
+./target/release/hakorune --aot program.hako
 ```
 
 ### ブラウザー実行