Add stock scoring commands

skills/openstock-agent-cli/references/commands/score/set/guide.md

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+# `openstock score set`
+
+Purpose: save or update a stock evaluation score.
+
+Usage:
+
+```bash
+openstock score set 005930 87
+```
+
+Inputs: `symbol`, `score` from 0 to 100.
+
+Writes: `~/.config/openstock/scores.json`.
+
+Output fields: `path`, `symbol`, `score`, `updated_at_unix`.
+
+Agent rule: use only when the user or scoring workflow has produced a concrete score.