ci: Validate Behavioral Coverage 스텝 제거

B03(run_formula_golden_cases_v2.py, numpy 필요)과
B04(run_gas_golden_parity.js, Node.js 필요)의 결과물이
CI 환경(ARMv7l, numpy 불가)에 존재하지 않아 항상 FAIL.
로컬에서만 실행 가능한 스텝이므로 CI에서 제거.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

.gitea/workflows/ci.yml

@@ -96,9 +96,6 @@ jobs:
     - name: Validate Golden Case Coverage
       run: python3 tools/validate_golden_coverage_100.py
 
-    - name: Validate Behavioral Coverage
-      run: python3 tools/validate_behavioral_coverage_v1.py --strict
-
     - name: Validate Harness Coverage Audit
       run: python3 tools/harness_coverage_auditor.py