feat(ECR-007): Wyckoff Live Structure with Confirmed/Live isolation

Add live.py lifecycle and event candidates; assemble confirmed vs live
in engine; Summary partition; execution_signal source=confirmed only.
Keep strategies untouched; do not lower Confirmed thresholds for Live.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/notes/WYCKOFF-LIVE-STRUCTURE-001.md

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+# WYCKOFF-LIVE-STRUCTURE-001
+
+**Status:** FROZEN  
+**Depends on:** WYCKOFF-MULTI-CYCLE-001  
+**Scope:** Live / Developing 结构层（独立于 Confirmed Engine）
+
+## 核心原则
+
+| Layer | 定位 |
+|-------|------|
+| Confirmed Engine | 历史结构事实 |
+| Live Engine | 当前结构推演 |
+
+禁止：
+
+- 降低 Spring/SOS Confirmed 条件
+- 用 Live candidate 替代 Confirmed event
+- Execution 消费 Live / FORMING / Candidate / Prediction
+
+## 状态机
+
+```
+UNKNOWN → FORMING → CONFIRMED → COMPLETED
+```
+
+## 数据契约（Live 不进 events[]）
+
+```json
+{
+  "cycles": [{
+    "id": 0,
+    "lifecycle": "FORMING",
+    "confirmed": { "phases": [], "events": [] },
+    "live": {
+      "phase_candidate": "D",
+      "event_candidates": [{ "type": "SOS", "confidence": 0.62, "confirmed": false }],
+      "next_expected": "LPS",
+      "confidence": { "cycle": 0.72, "phase": 0.68, "event": 0.55, "overall": 0.65 }
+    }
+  }],
+  "live": { "...": "顶层镜像 cycles[0].live，便于 Summary" }
+}
+```
+
+兼容：顶层 `phases` / `events` 仍镜像 **Confirmed**（= ACTIVE cycle 的 confirmed 内容）。
+
+## Candidate v1（仅启发式）
+
+- Range Formation：横盘时长、波动收敛 → Potential Trading Range  
+- Phase C candidate：测低 / 下影 / 缩量  
+- Event candidates：Spring / SOS / LPS / UTAD only  
+
+## Confidence
+
+可解释分层：`cycle` / `phase` / `event` / `overall`（structure+volume+event 加权），禁止黑盒 “AI probability”。
+
+## Execution
+
+```
+assert execution_signal.source == "confirmed"
+```
+
+## No Change
+
+- Confirmed 检测阈值、MULTI-CYCLE-001 排序、缠论 / strategies / chan_tv  
+
+## Only Change
+
+- `chanlun/analysis/wyckoff/live.py`  
+- engine 组装 `lifecycle` / `confirmed` / `live`  
+- Summary 面板分区  
+- 测例