feat(skills): add official optional 1password skill

optional-skills/security/1password/references/get-started.md

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+# 1Password CLI get-started (summary)
+
+Official docs: https://developer.1password.com/docs/cli/get-started/
+
+## Core flow
+
+1. Install `op` CLI.
+2. Enable desktop app integration in 1Password app.
+3. Unlock app.
+4. Run `op signin` and approve prompt.
+5. Verify with `op whoami`.
+
+## Multiple accounts
+
+- Use `op signin --account <subdomain.1password.com>`
+- Or set `OP_ACCOUNT`
+
+## Non-interactive / automation
+
+- Use service accounts and `OP_SERVICE_ACCOUNT_TOKEN`
+- Prefer `op run` and `op inject` for runtime secret handling