Add stock scoring commands

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

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+# `openstock score delete`
+
+Purpose: delete a saved stock evaluation score.
+
+Usage:
+
+```bash
+openstock score delete 005930
+```
+
+Inputs: `symbol`.
+
+Writes: `~/.config/openstock/scores.json` when a record exists.
+
+Output fields: `path`, `symbol`, `deleted`, `removed`.
+
+Agent rule: deletion changes local evaluation state; run only when requested.