docs: add design spec and implementation plan for docker service redeployment

docs/superpowers/plans/2026-04-01-docker-redeployment.md

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+# Docker Service Redeployment Implementation Plan
+
+> **For agentic workers:** REQUIRED SUB-SKILL: Use superpowers:subagent-driven-development (recommended) or superpowers:executing-plans to implement this plan task-by-task. Steps use checkbox (`- [ ]`) syntax for tracking.
+
+**Goal:** Redeploy Docker services on `docker-host11` to update Jellyfin to version 10.11 and Gitea to version 1.24-rootless.
+
+**Architecture:** Use the existing Ansible `docker.yaml` playbook and `docker_host` role to update the `compose.yaml` template on the target host, which triggers handlers to restart and recreate the containers with new images.
+
+**Tech Stack:** Ansible, Docker, Docker Compose, Jinja2.
+
+---
+
+### Task 1: Verify Host Connectivity
+
+**Files:**
+- Read: `vars/docker.ini`
+
+- [ ] **Step 1: Run Ansible ping to verify connectivity**
+
+Run: `ansible -i vars/docker.ini docker_host -m ping`
+Expected: `docker-host11 | SUCCESS => {"ping": "pong"}`
+
+- [ ] **Step 2: Check current running versions (baseline)**
+
+Run: `ansible -i vars/docker.ini docker_host -m shell -a "docker ps --format '{{.Names}}: {{.Image}}'"`
+Expected: `jellyfin: jellyfin/jellyfin:10.10` and `gitea: gitea/gitea:1.23-rootless` (or currently running versions).
+
+### Task 2: Execute Redeployment Playbook
+
+**Files:**
+- Read: `playbooks/docker.yaml`
+- Read: `vars/group_vars/docker/docker.yaml` (already modified with new versions)
+
+- [ ] **Step 1: Run the full Docker deployment playbook**
+
+Run: `ansible-playbook -i vars/docker.ini playbooks/docker.yaml`
+Expected: Playbook completes with `changed` for the `docker_host` role (template task) and `ok` for others.
+
+- [ ] **Step 2: Commit changes to the repository**
+
+```bash
+git add vars/group_vars/docker/docker.yaml
+git commit -m "chore: update jellyfin to 10.11 and gitea to 1.24-rootless"
+```
+
+### Task 3: Verify Post-Deployment State
+
+**Files:**
+- N/A
+
+- [ ] **Step 1: Verify new versions are running**
+
+Run: `ansible -i vars/docker.ini docker_host -m shell -a "docker ps --format '{{.Names}}: {{.Image}}'"`
+Expected: 
+- `jellyfin: jellyfin/jellyfin:10.11`
+- `gitea: gitea/gitea:1.24-rootless`
+
+- [ ] **Step 2: Verify container health status**
+
+Run: `ansible -i vars/docker.ini docker_host -m shell -a "docker ps --format '{{.Names}}: {{.Status}}'"`
+Expected: Both containers show `Up` and `(healthy)` (if healthchecks are active).