Add databricks skills installer

skills/.curated/databricks-skill-installer/SKILL.md

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+---
+name: databricks-skill-installer
+description: Run `databricks experimental aitools install --global` to install or refresh Databricks skills for Codex and other supported coding agents. Use when Codex needs to bootstrap Databricks skills with the Databricks CLI or install a specific Databricks skill such as `databricks-apps` or `databricks-jobs`.
+---
+
+# Databricks Skill Installer
+
+First check:
+
+```bash
+databricks -v
+```
+
+If the command is missing, follow the upstream Databricks CLI install guide and treat it as the source of truth. In a sandboxed agent session, show the user the appropriate install command from that guide and ask them to run it in their own terminal.
+
+[databricks-cli-install.md](https://github.com/databricks/databricks-agent-skills/blob/main/skills/databricks/databricks-cli-install.md)
+
+Run:
+
+```bash
+databricks experimental aitools install --global --agents codex
+```
+
+Install one skill with:
+
+```bash
+databricks experimental aitools install --global --agents codex --skills databricks-apps
+```
+
+After installation, open the installed Databricks skill under `${CODEX_HOME:-~/.codex}/skills` and follow its upstream `SKILL.md`.

skills/.curated/databricks-skill-installer/agents/openai.yaml

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+interface:
+  display_name: "Databricks Skills"
+  short_description: "Install Databricks skills for Codex"
+  icon_small: "./assets/databricks.svg"
+  icon_large: "./assets/databricks.png"
+  brand_color: "#FF3621"
+  default_prompt: "Use $databricks-skill-installer to install or update Databricks skills from the official Databricks repository."