phase: 20.49 COMPLETE; 20.50 Flow+String minimal reps; 20.51 selfhost v0/v1 minimal (Option A/B); hv1-inline binop/unop/copy; docs + run_all + CURRENT_TASK -> 21.0

docs/reference/architecture/plugin-migration-request.md

@@ -144,7 +144,7 @@ cd ../../tools/plugin-tester
 ./target/release/plugin-tester ../../plugins/nyash-xxx-plugin/target/release/libnyash_xxx_plugin.so
 
 # Nyashで実行テスト
-./target/release/nyash test_xxx.nyash
+./target/release/nyash test_xxx.hako
 ```
 
 ## 📝 特記事項
@@ -346,7 +346,7 @@ cd ../../tools/plugin-tester
 
 ### 3. Nyashで実行
 ```nyash
-// test_http.nyash
+// test_http.hako
 local http = new HttpClientBox()
 local response = http.get("https://api.example.com/data")
 print(response)