Add OpenStock agent CLI skill

skills/openstock-agent-cli/references/commands/account/guide.md

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+# `openstock account`
+
+## Purpose
+
+Read KIS account state for the configured live account.
+
+## Subcommands
+
+| Command | Purpose |
+| --- | --- |
+| `openstock account status` | Show balance and holdings. |
+
+## `account status`
+
+### Usage
+
+```bash
+openstock account status
+```
+
+### IO
+
+| Direction | Data |
+| --- | --- |
+| Env read | `KIS_ACCESS_TOKEN`, `KIS_APPKEY`, `KIS_APPSECRET`, `KIS_ACCOUNT` |
+| External IO | KIS balance inquiry endpoint. |
+| File IO | `~/.config/openstock/.env` read. |
+| Side effect | none |
+
+### Output Fields
+
+| Field | Meaning |
+| --- | --- |
+| `broker` | Broker API used for inquiry. |
+| `account` | Queried account number. |
+| `balance` | Cash, total evaluated asset amount, profit/loss, and account summary values. |
+| `holdings` | Currently held stock list. |
+
+## Agent Notes
+
+Use this before any proposed trade to check cash, holdings, and orderable quantity context.