docs(thesis): add thesis ledger and monthly check workflow

.github/workflows/thesis-check.yml

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+name: Thesis Check
+
+on:
+  schedule:
+    - cron: "0 2 1 * *"
+  workflow_dispatch:
+
+permissions:
+  contents: read
+  issues: write
+
+jobs:
+  thesis:
+    runs-on: ubuntu-latest
+    timeout-minutes: 10
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Set up Python
+        uses: actions/setup-python@v6
+        with:
+          python-version: "3.11"
+
+      - name: Validate thesis ledger
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_REPOSITORY: ${{ github.repository }}
+        run: |
+          set -euo pipefail
+          python - <<'PY'
+          import json, os, pathlib, subprocess, sys
+          path = pathlib.Path("docs/thesis-ledger.json")
+          if not path.exists():
+              print("::error::docs/thesis-ledger.json missing")
+              sys.exit(1)
+          data = json.loads(path.read_text())
+          strategies = data.get("strategies") or {}
+          if not strategies:
+              print("::error::no strategies in thesis ledger")
+              sys.exit(1)
+          failures = []
+          warnings = []
+          for name, row in strategies.items():
+              fals = row.get("falsification_conditions") or []
+              if not row.get("thesis"):
+                  failures.append(f"{name}: missing thesis")
+              if len(fals) < 2:
+                  failures.append(f"{name}: need >=2 falsification_conditions")
+              hit = row.get("hit_rate")
+              if hit is not None and float(hit) < 0.5:
+                  warnings.append(f"{name}: hit_rate {hit} < 0.5")
+              if str(row.get("verdict", "")).lower() in {"falsified", "failed", "reject"}:
+                  failures.append(f"{name}: verdict={row.get('verdict')}")
+          print(f"[thesis-check] strategies={len(strategies)} failures={len(failures)} warnings={len(warnings)}")
+          for item in failures:
+              print(f"::error::{item}")
+          for item in warnings:
+              print(f"::warning::{item}")
+          repo = os.environ.get("GITHUB_REPOSITORY", "")
+          token = os.environ.get("GH_TOKEN", "")
+          if failures and repo and token:
+              title = f"[thesis-check] falsification/validation failures ({len(failures)})"
+              body = "\n".join(f"- {x}" for x in failures)
+              # create issue (best-effort)
+              subprocess.run([
+                  "gh", "issue", "create", "--title", title, "--body", body + "\n\ncc @Pigbibi"
+              ], check=False)
+          sys.exit(1 if failures else 0)
+          PY

docs/thesis-ledger.json

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+{
+  "strategies": {
+    "hk_global_etf_tactical_rotation": {
+      "thesis": "港股通全球ETF存在可交易的战术动量/风险切换效应",
+      "falsification_conditions": [
+        "滚动12个月相对等权基准超额 < 0",
+        "最大回撤超过回测基线 1.5 倍"
+      ],
+      "created": "2025-09-01",
+      "last_verified": "2026-07-08",
+      "verdict": "active",
+      "hit_rate": null,
+      "status_note": "runtime_enabled"
+    },
+    "hk_low_vol_dividend_quality_snapshot": {
+      "thesis": "港股低波+红利质量快照组合在风险调整后优于等权港股",
+      "falsification_conditions": [
+        "滚动12个月 Sharpe < 基准",
+        "红利因子 IC 连续3个月 < 0"
+      ],
+      "created": "2025-10-01",
+      "last_verified": "2026-07-08",
+      "verdict": "active",
+      "hit_rate": null,
+      "status_note": "runtime_enabled"
+    }
+  }
+}