Add Claude Code command for updating EOL Istio versions

.claude/commands/update-eol-versions.md

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+# Update EOL Istio Versions
+
+This command automates the process of marking End-of-Life (EOL) Istio versions in the versions.yaml file.
+
+## Tasks
+
+1. **Fetch supported Istio versions** from istio.io:
+   - Visit https://istio.io/latest/docs/releases/supported-releases/ to get the list of currently supported Istio versions
+   - Identify which major.minor versions are still supported upstream
+   - Note the EOL dates for versions that are no longer supported
+
+2. **Analyze what changes are needed**:
+   - Read `pkg/istioversion/versions.yaml` (or the file specified by VERSIONS_YAML_FILE env var)
+   - Compare the current state with the upstream supported versions
+   - Identify versions that need to be marked as EOL (not supported upstream but missing `eol: true`)
+   - Identify versions that need EOL removed (supported upstream but have `eol: true`)
+   - **If no changes are needed**, inform the user that all versions are already up-to-date and STOP
+   - Only proceed to the next steps if changes are required
+
+3. **Create a new git branch** for this update (only if changes are needed):
+   - Branch name should be: `update-eol-versions-YYYY-MM-DD` (use today's date)
+   - Ensure the working directory is clean before creating the branch
+   - If there are uncommitted changes, ask the user what to do
+
+4. **Update versions.yaml**:
+   - For each version entry that needs changes:
+     - If the version is NOT supported upstream and doesn't already have `eol: true`, add `eol: true` to that version entry
+     - If a version has `eol: true` but is still supported upstream, remove the `eol: true` flag (this handles corrections)
+   - Preserve the YAML structure and comments
+   - For EOL versions, remove the `charts:` section since EOL versions are not installable
+
+5. **Run code generation**:
+   - Execute `make gen` to regenerate all necessary code and manifests
+   - This ensures CRDs and other generated files are updated
+
+6. **Show summary**:
+   - List all versions that were marked as EOL
+   - List all versions that had EOL status removed (if any)
+   - Show the git diff of changes made to versions.yaml
+   - Provide next steps for the user (review changes, run tests, commit, create PR)
+
+## Important Notes
+
+- Only mark versions as EOL if they are confirmed to be EOL upstream
+- Preserve all existing version entries - do not remove them from the file
+- The `eol: true` flag makes versions uninstallable but keeps them as valid spec.version values for API compatibility
+- After marking as EOL, the charts array should be removed since EOL versions don't need chart URLs
+- Always verify the changes before committing
+
+## Example Version Entry
+
+Before (supported version):
+```yaml
+- name: v1.25.0
+  version: 1.25.0
+  repo: https://github.com/istio/istio
+  commit: 1.25.0
+  charts:
+    - https://istio-release.storage.googleapis.com/charts/base-1.25.0.tgz
+    - https://istio-release.storage.googleapis.com/charts/istiod-1.25.0.tgz
+```
+
+After (EOL version):
+```yaml
+- name: v1.25.0
+  eol: true
+```