chore: add script to spawn agent worktree with environment setup

.claude/skills/fix-issue/SKILL.md

@@ -4,7 +4,23 @@ description: Implement a GitHub issue with reproduction and verification
 allowed-tools: Bash, Edit, Write, Read, Glob, Grep, mcp__playwright__*, mcp__dokploy__*
 ---
 
-The issue number is passed as $1. An isolated instance is running at $DOKPLOY_BASE_URL.
+The issue number is passed as $1.
+
+## Instance
+
+No instance is running yet — start your own, isolated to this worktree:
+
+1. Check `apps/dokploy/.env` for `PORT` (assigned per-worktree already).
+2. If nothing is listening on that port, start it: `pnpm dokploy:dev` in the
+   background, then poll `curl -s -o /dev/null -w '%{http_code}' http://localhost:$PORT`
+   until it answers (usually ~10-15s).
+3. Use `http://localhost:$PORT` as the base URL for Playwright navigation.
+
+Note: `mcp__dokploy__*` (this repo's `.mcp.json`) resolves its URL from
+`$DOKPLOY_BASE_URL` once, at session startup — it cannot pick up a port
+discovered mid-session. If those tools are unavailable or point at the wrong
+instance, fall back to `curl`/`gh api` for API-level checks, or ask the user
+to relaunch with `DOKPLOY_BASE_URL` exported first.
 
 ## Tools