refactor(gas): GAS 중복 함수 제거 및 루트 레벨 stale .gs 파일 정리

- gas_apex_alpha_watch.gs: gas_apex_runtime_core.gs의 5개 실 구현을 shadowing하던
  stub/구버전 제거 (applyApexMacroAlphaSuiteImpl_, applyApexMacroEventSuiteImpl_,
  calcConsistencyValidatorV2Impl_, calcMacroEventSynchronizerV1Impl_,
  calcMacroRegimeAdaptiveGateV2Impl_)
- gas_lib.gs: gdf_05_alpha_engines.gs로 이전된 runAlphaFeedbackLoop_,
  getAlphaFeedbackJson_ 스테일 사본 제거
- 루트 레벨 .gs 8개 삭제: src/gas/ 구조 이전 전 구버전, 배포 경로 밖 dead code

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

src/gas/core/gas_lib.gs

@@ -474,31 +474,6 @@ function appendAlphaHistory_(ss, aewRows, holdings, dfMap, marketRegime) {
   });
 }
 
-function getAlphaFeedbackJson_() {
-  var defaultPayload = {
-    formula_id: 'ALPHA_FEEDBACK_LOOP_V1',
-    as_of: '',
-    analysis_period: '',
-    status: 'DATA_MISSING',
-    cases_analyzed: 0,
-    grade_count: 0,
-    eligible_t20_fail_rate: null,
-    eligible_t60_fail_rate: null,
-    recommended_filter_adjustments: [],
-    grade_summary: []
-  };
-  try {
-    var settings = readSettingsTab_();
-    var raw = settings['afl_v1_last_result'];
-    if (!raw) return defaultPayload;
-    var payload = typeof raw === 'string' ? JSON.parse(raw) : raw;
-    return payload && typeof payload === 'object' ? payload : defaultPayload;
-  } catch (e) {
-    Logger.log('[AFL] getAlphaFeedbackJson_ error: ' + e.message);
-    return defaultPayload;
-  }
-}
-
 // ── settings 탭 읽기 → 사용자 입력 파라미터 (total_asset 등) ────────────────
 // settings 탭: row2=헤더(key|value|note), row3+=데이터
 // 없으면 빈 객체 반환 (각 호출처에서 null 처리)
@@ -2406,143 +2381,6 @@ function getOrbitGapJson() {
   };
 }
 
-// ── [2026-05-21_AFL_V1] ALPHA_FEEDBACK_LOOP_V1 -- monthly grade analysis ────────
-function runAlphaFeedbackLoop_() {
-  var ss = getSpreadsheet_();
-  var sheet = ss.getSheetByName("alpha_history");
-  var today = Utilities.formatDate(new Date(), "Asia/Seoul", "yyyy-MM-dd");
-  var monthKey = today.substring(0, 7);
-  var defaultPayload = {
-    formula_id: 'ALPHA_FEEDBACK_LOOP_V1',
-    as_of: today,
-    analysis_period: monthKey,
-    status: 'DATA_MISSING',
-    cases_analyzed: 0,
-    grade_count: 0,
-    eligible_t20_fail_rate: null,
-    eligible_t60_fail_rate: null,
-    recommended_filter_adjustments: [],
-    grade_summary: []
-  };
-  if (!sheet) {
-    writeSettingValue_(ss, 'afl_v1_last_result', JSON.stringify(defaultPayload));
-    Logger.log("[AFL] alpha_history sheet not found");
-    return defaultPayload;
-  }
-  var data = sheet.getDataRange().getValues();
-  if (data.length < 2) {
-    writeSettingValue_(ss, 'afl_v1_last_result', JSON.stringify(defaultPayload));
-    Logger.log("[AFL] alpha_history has no data");
-    return defaultPayload;
-  }
-
-  var hdrRow = data[0];
-  var hdrMap = {};
-  hdrRow.forEach(function(h, i) { hdrMap[h] = i; });
-
-  var gradeStats = {};
-  var analyzedCases = 0;
-  for (var i = 1; i < data.length; i++) {
-    var row   = data[i];
-    var grade = String(row[hdrMap['SAQG_Grade_At_Entry']] || '').trim();
-    var t20g  = String(row[hdrMap['T20_Alpha_Gate']]      || '').trim();
-    var t60g  = String(row[hdrMap['T60_Alpha_Gate']]      || '').trim();
-    if (!grade) continue;
-    if (!gradeStats[grade]) gradeStats[grade] = { t20_total: 0, t20_pass: 0, t60_total: 0, t60_pass: 0 };
-    var s = gradeStats[grade];
-    var skipVals = { 'NOT_YET': 1, 'EXEMPT': 1, 'DATA_MISSING': 1, '': 1 };
-    var hasT20 = t20g && !skipVals[t20g];
-    var hasT60 = t60g && !skipVals[t60g];
-    if (hasT20) { s.t20_total++; if (t20g === 'T20_ALPHA_PASS') s.t20_pass++; }
-    if (hasT60) { s.t60_total++; if (t60g === 'T60_ALPHA_PASS') s.t60_pass++; }
-    if (hasT20 || hasT60) analyzedCases++;
-  }
-
-  var gradeSummary = [];
-  Object.keys(gradeStats).sort().forEach(function(grade) {
-    var s   = gradeStats[grade];
-    var t20FailRate = s.t20_total > 0 ? parseFloat((((s.t20_total - s.t20_pass) / s.t20_total) * 100).toFixed(2)) : null;
-    var t60FailRate = s.t60_total > 0 ? parseFloat((((s.t60_total - s.t60_pass) / s.t60_total) * 100).toFixed(2)) : null;
-    var t20PassRate = s.t20_total > 0 ? parseFloat(((s.t20_pass / s.t20_total) * 100).toFixed(2)) : null;
-    var t60PassRate = s.t60_total > 0 ? parseFloat(((s.t60_pass / s.t60_total) * 100).toFixed(2)) : null;
-    gradeSummary.push({
-      grade: grade,
-      t20_total: s.t20_total,
-      t20_pass: s.t20_pass,
-      t20_pass_rate: t20PassRate,
-      t20_fail_rate: t20FailRate,
-      t60_total: s.t60_total,
-      t60_pass: s.t60_pass,
-      t60_pass_rate: t60PassRate,
-      t60_fail_rate: t60FailRate,
-      status: (s.t20_total >= 10 || s.t60_total >= 10) ? 'ANALYZED' : 'DATA_INSUFFICIENT'
-    });
-  });
-
-  var eligibleRow = gradeStats['ELIGIBLE'] || { t20_total: 0, t20_pass: 0, t60_total: 0, t60_pass: 0 };
-  var eligibleT20FailRate = eligibleRow.t20_total > 0
-    ? parseFloat((((eligibleRow.t20_total - eligibleRow.t20_pass) / eligibleRow.t20_total) * 100).toFixed(2))
-    : null;
-  var eligibleT60FailRate = eligibleRow.t60_total > 0
-    ? parseFloat((((eligibleRow.t60_total - eligibleRow.t60_pass) / eligibleRow.t60_total) * 100).toFixed(2))
-    : null;
-  var eligibleT20PassRate = eligibleRow.t20_total > 0
-    ? parseFloat(((eligibleRow.t20_pass / eligibleRow.t20_total) * 100).toFixed(2))
-    : null;
-
-  var recommendations = [];
-  if (analyzedCases >= 10) {
-    if (eligibleT20FailRate !== null && eligibleT20FailRate > 50) {
-      recommendations.push({
-        filter_id: 'SAQG_F2_RECOVERY_RATIO',
-        current: '1.20',
-        recommended: '1.35',
-        rationale: 'ELIGIBLE T+20 fail rate > 50%',
-        action: 'TIGHTEN'
-      });
-      recommendations.push({
-        filter_id: 'SAQG_F3_EXCESS_DRAWDOWN',
-        current: '5%p',
-        recommended: '4%p',
-        rationale: 'ELIGIBLE T+20 fail rate > 50%',
-        action: 'TIGHTEN'
-      });
-    } else if (eligibleT20PassRate !== null && eligibleT20PassRate > 70 && eligibleRow.t20_total >= 12) {
-      recommendations.push({
-        filter_id: 'SAQG_F3_EXCESS_DRAWDOWN',
-        current: '5%p',
-        recommended: '7%p',
-        rationale: 'ELIGIBLE T+20 success rate > 70% and cases >= 12',
-        action: 'RELAX_REVIEW'
-      });
-    } else {
-      recommendations.push({
-        filter_id: 'SAQG_F1_F2_F3',
-        current: 'UNCHANGED',
-        recommended: 'HOLD',
-        rationale: 'No threshold change supported by current sample',
-        action: 'HOLD'
-      });
-    }
-  }
-
-  var payload = {
-    formula_id: 'ALPHA_FEEDBACK_LOOP_V1',
-    as_of: today,
-    analysis_period: monthKey,
-    status: analyzedCases >= 10 ? 'ANALYZED' : 'DATA_INSUFFICIENT',
-    cases_analyzed: analyzedCases,
-    grade_count: Object.keys(gradeStats).length,
-    eligible_t20_fail_rate: eligibleT20FailRate,
-    eligible_t60_fail_rate: eligibleT60FailRate,
-    recommended_filter_adjustments: analyzedCases >= 10 ? recommendations : [],
-    grade_summary: gradeSummary
-  };
-  writeSettingValue_(ss, 'afl_v1_last_result', JSON.stringify(payload));
-  Logger.log('[AFL] done - ' + payload.grade_count + ' grades analyzed, cases=' + analyzedCases);
-  return payload;
-}
-
 // ── E2: 월말 자산 스냅샷 → monthly_history 기록 ─────────────────────────────
 // 트리거: 매달 마지막 영업일 16:30 독립 실행 OR runDataFeed 완료 후 호출.
 function runMonthlySnapshot() {