feat(blog): announce /cozystack:wizard guided installer (#542)

## Summary

New blog post announcing `/cozystack:wizard`, a guided end-to-end
Cozystack installer.

## What

- Adds `content/en/blog/2026-05-19-introducing-cozystack-wizard/` as a
page bundle
- Dated 2026-05-19, author Timur Tukaev
- Ships a 1200x630 image used both as the hero and as the OG / social
card (`images:` frontmatter)
- Tagged as `article_types: announcement`, topics `platform` and
`install`

## Why

- Announces a new user-facing feature: a guided installer that handles
Talos / Ubuntu / Existing-cluster flows and the long tail of install
edge cases (cert-SAN traps on NAT'd clouds, ZFS on Talos, LINSTOR
registration races, boot-to-Talos upgrades)
- Surfaces a breaking change for plugin users: five plugins consolidated
into `cozystack` + `linstor` with renamed skills — existing installs
must reinstall

## Preview

Netlify deploy preview will appear on this PR once CI finishes.

<!-- This is an auto-generated comment: release notes by coderabbit.ai
-->

## Summary by CodeRabbit

* **Documentation**
* New blog post announcing the Cozystack Wizard, a guided installer for
end-to-end deployment across Talos, Ubuntu, and existing clusters, with
edge case handling and upgrade support.

* **Breaking Changes**
* Five plugins consolidated into `cozystack` and `linstor` with updated
installation commands. Refer to documentation for migration details.

<!-- review_stack_entry_start -->

[![Review Change
Stack](https://storage.googleapis.com/coderabbit_public_assets/review-stack-in-coderabbit-ui.svg)](https://app.coderabbit.ai/change-stack/cozystack/website/pull/542?utm_source=github_walkthrough&utm_medium=github&utm_campaign=change_stack)

<!-- review_stack_entry_end -->

<!-- end of auto-generated comment: release notes by coderabbit.ai -->

Author: tym83

content/en/blog/2026-05-19-introducing-cozystack-wizard/cozystack-wizard.png

@@ -0,0 +1,52 @@
+---
+title: "Introducing /cozystack:wizard — a Guided Cozystack Installer"
+slug: introducing-cozystack-wizard
+date: 2026-05-19
+author: "Timur Tukaev"
+description: "/cozystack:wizard is a new guided installer that orchestrates a full Cozystack deployment end-to-end across Talos, Ubuntu, and existing clusters — handling cert-SAN traps on NAT'd clouds, ZFS provisioning, LINSTOR registration races, and more."
+images:
+  - "cozystack-wizard.png"
+article_types:
+  - announcement
+topics:
+  - platform
+  - install
+---
+
+![Cozystack wizard](cozystack-wizard.png)
+
+We've shipped **`/cozystack:wizard`** — a guided Cozystack installer.
+
+Tell it `Talos`, `Ubuntu`, or `Existing`, and it orchestrates the whole chain end-to-end. It handles cert-SAN traps on NAT'd clouds (OCI, GCP, AWS), ZFS provisioning on Talos, LINSTOR registration races, and a dozen other traps that bit us during real-install testing.
+
+Boot-to-Talos works too: if nodes already came up on base Talos, the wizard upgrades them to the Cozystack-tuned image. The end-to-end path is validated on a 3-node OCI Talos cluster.
+
+## Breaking change: plugin consolidation
+
+We have consolidated five plugins into two — `cozystack` and `linstor` — and renamed the skills. If you had the old plugins, uninstall the previous ones and reinstall:
+
+```bash
+/plugin install cozystack@cozystack-claude-plugins
+/plugin install linstor@cozystack-claude-plugins
+```
+
+Then run:
+
+```bash
+/cozystack:wizard
+```
+
+## Try it and send feedback
+
+The wizard is meant to take you from a fresh set of nodes (or an existing cluster) to a running Cozystack without manually chasing the long tail of edge cases. We've stress-tested it on the configurations above, but the more environments it sees, the better it gets.
+
+Please try it out and let us know what worked, what broke, and what was confusing.
+
+---
+
+## Join the community
+
+- GitHub: [github.com/cozystack/cozystack](https://github.com/cozystack/cozystack)
+- Telegram community: [t.me/cozystack](https://t.me/cozystack/)
+- Cozystack in Kubernetes Slack: [#cozystack](https://kubernetes.slack.com/archives/C06L3CPRVN1) (need an invite? [slack.kubernetes.io](https://slack.kubernetes.io))
+- Community Meeting Calendar: [cozystack.io/community](https://cozystack.io/community/)