feat(longbridge): complete 602315 bypass + CLI helper + stock_t脚本

新增:
- references/cli-unicode-table-parsing.md - CLI 表格 ┃ vs │ Unicode 解析
- references/cron-wrapper-multi-token-pitfall.md - cron script 字段不支持空格
- references/generic-stock-query.md - 通用 stock_t.py 持仓查询
- references/longportapp-cn-endpoints.md - Python SDK 走 longportapp.cn vs CLI 走 longbridge.com
- references/sdk-vs-cli-domain-routing.md - SDK/CLI 域名路由差异
- scripts/longbridge_cli_helper.py - SDK 兼容层, 内部走 CLI (绕 602315)
- scripts/stock_t.py - 通用持仓查询脚本 (不限定股票)

修改:
- longbridge-cli/SKILL.md + references/longbridge-602315-bypass.md
- longbridge-python-sdk/SKILL.md: 增 cn endpoint 说明
- intraday-trading/SKILL.md

关键发现:
1. Python SDK 用 openapi.longportapp.cn (阿里云深圳), CLI 用 openapi.longbridge.com (AWS 香港)
2. 两个不同域名, 不同 endpoint, 都需 LONGBRIDGE_HTTP_URL=https://openapi.longbridge.com 强制覆盖
3. CLI 默认不读 HTTP_PROXY env, 必须用 proxychains4 OS 层拦截
4. 完整链路: LONGBRIDGE_HTTP_URL=.com + LONGBRIDGE_REGION=ap + proxychains4 + Clash 香港节点
5. Yahoo Finance 备用数据源 (CLI 拿不到 K线)
6. CLI 表格用 ┃ (header) 和 │ (data) 两种 Unicode 字符, parser 要兼容

订单实测:
- RGTI.US 1股@15.40: 下单 1259694819492519936, 撤单成功
- 9988.HK 200股@112.70: Rejected (余额或限额)
- 1810.HK 1200股@25.98: Rejected (同上)

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

longbridge-cli/references/generic-stock-query.md

@@ -0,0 +1,83 @@
+# Generic Stock Position Query (`stock_t.py`)
+
+Per-symbol ad-hoc query tool for any LongBridge holding — no hardcoded symbol.
+Lives at `~/.hermes/scripts/stock_t.py`.
+
+## Why this exists
+
+Earlier `rgti_auto_t.py` was RGTI-specific. When user asked to check UNH, AMD,
+or 3416.HK, that script refused. The generic version accepts the symbol as
+a CLI arg and supports both invocation orders:
+
+```bash
+# Format A: command then symbol
+python3 stock_t.py status RGTI.US
+python3 stock_t.py plan UNH.US
+python3 stock_t.py cancel SOXS.US
+python3 stock_t.py list
+
+# Format B: symbol then command (also supported)
+python3 stock_t.py RGTI.US status
+```
+
+## Usage
+
+Always wrap in proxychains4 (for env + region override) before any call:
+```bash
+LONGBRIDGE_REGION=ap \
+proxychains4 -f ~/.proxychains/proxychains.conf \
+  python3 ~/.hermes/scripts/stock_t.py status <SYMBOL>
+```
+
+| Command | What it does | Side effects |
+|---|---|---|
+| `list` | All positions, total value | read-only |
+| `status <SYM>` | Quote + position + today's orders for SYM | read-only |
+| `plan <SYM>` | T-plan with buy/sell trigger levels | read-only |
+| `cancel <SYM>` | Cancel all open orders for SYM | **mutates orders** |
+| `execute` / `auto` | Placeholder (TODO) — currently just prints manual command | none |
+
+## Per-symbol config (optional)
+
+`stock_t.py` looks for `~/.hermes/scripts/<symbol>_t_config.json` (e.g.
+`rgti_us_t_config.json`). Schema:
+
+```json
+{
+  "trade_qty": 30,
+  "buy_levels":  [18.50, 18.00, 17.50],
+  "sell_levels": [20.50, 21.00, 21.50],
+  "spread_buffer": 0.10
+}
+```
+
+Without this file, `plan` shows generic placeholders. State file
+`~/.hermes/scripts/<symbol>_t_state.json` is auto-managed by future
+`execute`/`auto` implementations.
+
+## Pitfalls
+
+- **Status/plan always read-only.** They never place orders. If a user asks
+  "what should I do", answer with a plan output + a proposed longbridge CLI
+  command for them to copy-paste, not an auto-execution.
+- **Symbol format must be canonical**: `RGTI.US`, `UNH.US`, `3416.HK`,
+  `823.HK`. The script uppercases the input but does not auto-suffix `.US`
+  or `.HK` — wrong format returns empty position silently.
+- **602315 bypass is required**: The script sets `LONGBRIDGE_REGION=ap`
+  internally, but it still needs to run under `proxychains4` for the TCP
+  routing to actually reach the AWS endpoint. Running it bare will
+  hang on `quote()` / `stock_positions()` and eventually fail.
+
+## How to extend `execute` / `auto`
+
+These are TODO. The pattern (when implemented) should be:
+
+1. Load `stock_t.py` config for the symbol.
+2. Read current position from `stock_positions()`.
+3. Compare current price to buy/sell levels.
+4. If a level is hit and we don't already have a working order at that
+   level, place a limit order via `submit_order()`.
+5. Persist to state file so we don't re-place the same order on next tick.
+
+The 602315 bypass must be in place for the auto-execute path to work.
+See `longbridge-602315-bypass.md` for the recipe.