feat: add maintenance-pr skill for OpenCode

Author: frisoft

.opencode/skills/maintenance-pr/SKILL.md

@@ -0,0 +1,53 @@
+---
+name: maintenance-pr
+description: Run maintenance.sh, automatically apply fixes on a new branch, and create a PR
+risk: low
+source: repository
+---
+
+# Maintenance PR Skill
+
+This skill runs the project's maintenance script, automatically applies required fixes, and creates a pull request with the changes.
+
+## Workflow
+
+### Step 1: Run maintenance.sh
+Run the maintenance script to check for issues:
+```bash
+cd /home/andrea/Source/ateam && ./maintenance.sh
+```
+
+### Step 2: Analyze output
+Parse the output for:
+- Unused dependencies (shown by cargo-machete)
+- Outdated dependencies (shown by cargo outdated)
+- Any errors or warnings
+
+### Step 3: Apply fixes
+For each issue found:
+- **Unused dependencies**: Remove from `Cargo.toml`
+- **Outdated dependencies**: Update to latest versions using `cargo update -p <package>` or update version in `Cargo.toml` directly
+
+### Step 4: Create branch
+Create a new branch for the changes:
+```bash
+cd /home/andrea/Source/ateam && git checkout -b maintenance/$(date +%Y-%m-%d)
+```
+
+### Step 5: Commit and push
+Commit the changes and push to remote:
+```bash
+git add -A && git commit -m "chore: apply maintenance fixes" && git push -u origin HEAD
+```
+
+### Step 6: Create PR
+Create a pull request using gh CLI:
+```bash
+gh pr create --title "chore: apply maintenance fixes" --body "Automated maintenance fixes from ./maintenance.sh"
+```
+
+## Requirements
+
+- `cargo-machete` (replacement for cargo-udeps)
+- `cargo-outdated` (for checking outdated dependencies)
+- `gh` CLI (for creating PRs)