Add OpenStock agent CLI skill

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

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+# `openstock dart`
+
+## Purpose
+
+Query OpenDART listed-company mappings, disclosure lists, and disclosure documents.
+
+## Subcommands
+
+| Command | Purpose |
+| --- | --- |
+| `openstock dart sync [--force]` | Refresh OpenDART corp code cache. |
+| `openstock dart status` | Show corp code cache status. |
+| `openstock dart corp <symbol>` | Resolve KRX symbol to DART corp code. |
+| `openstock dart disclosures [symbol] [--corp-code CODE] [--from YYYYMMDD] [--to YYYYMMDD] [--corp-cls Y|K|N|E] [--page-no N] [--page-count N]` | Query disclosure list. |
+| `openstock dart document <rcept_no> [--force] [--max-chars N]` | Fetch disclosure document text. |
+| `openstock dart show <symbol> [--from YYYYMMDD] [--to YYYYMMDD] [--index N] [--page-count N] [--force] [--max-chars N]` | Query disclosures for a symbol and fetch one selected document. |
+
+## IO
+
+| Direction | Data |
+| --- | --- |
+| Env read | `OPENDART_API_KEY` for OpenDART API calls. |
+| External IO | OpenDART corp code, list, and document endpoints. |
+| File read/write | `~/.config/openstock/cache/opendart`. |
+| Side effect | `sync`, `document`, and `show` can write cache. |
+
+## Important Fields
+
+| Field | Meaning |
+| --- | --- |
+| `stock_code` | KRX stock code. |
+| `corp_code` | OpenDART 8-digit company code. |
+| `corp_name` | OpenDART company name. |
+| `modify_date` | Corp code mapping modification date. |
+| `query` | Disclosure query sent to OpenDART. |
+| `resolved` | Symbol/corp code resolution details. |
+| `disclosures` | Disclosure list. |
+| `selected` | Disclosure selected by `--index`. |
+| `document` | Disclosure document metadata and extracted text. |
+
+## Agent Notes
+
+Use `dart show` for the common workflow: symbol to disclosures to selected document. Use `dart disclosures` when only the list is needed.