Merge pull request 'docs(spec39): GAS_THIN_ADAPTER migration_plan DONE' (#44) from feature/gas-thin-adapter-phase3-done into main

docs(spec39): GAS_THIN_ADAPTER migration_plan DONE

spec/39_gas_thin_adapter_policy.yaml

@@ -15,7 +15,7 @@ forbidden_responsibilities:
   - take_profit
   - risk_score
 migration_plan:
-  status: IN_PROGRESS
+  status: DONE
   phases:
     - phase: inventory
       status: DONE
@@ -26,7 +26,7 @@ migration_plan:
       target: tools/
       action: business_logic 함수를 Python compiler/stub layer로 이전한다.
     - phase: thin_adapter
-      status: IN_PROGRESS
+      status: DONE
       target: gas_*.gs
       action: collect/normalize/export/display만 남기고 나머지를 호출 위임으로 전환한다.
     - phase: verify