fix: address 5 critical and major PR review issues

- Remove set -e from validate-marketplace.sh to prevent early exit on
  check failures, allowing the summary to always be displayed (PRRT_kwDOO6Hdxs5uvKrc)
- Fix marketplace.json source path to point to skills/unraid instead of
  ./ for correct plugin directory resolution (PRRT_kwDOO6Hdxs5uvKrg)
- Fix misleading trap registration comment in unraid-api-crawl.md and
  add auth note to Apollo Studio URL (PRRT_kwDOO6Hdxs5uvO2t)
- Extract duplicated cleanup-with-error-handling in main.py into
  _run_shutdown_cleanup() helper (PRRT_kwDOO6Hdxs5uvO3A)
- Add input validation to read-logs.sh to prevent GraphQL injection
  via LOG_NAME and LINES parameters (PRRT_kwDOO6Hdxs5uvKrj)

.claude-plugin/marketplace.json

@@ -12,7 +12,7 @@
   "plugins": [
     {
       "name": "unraid",
-      "source": "./",
+      "source": "skills/unraid",
       "description": "Query and monitor Unraid servers via GraphQL API - array status, disk health, containers, VMs, system monitoring",
       "version": "0.2.0",
       "tags": ["unraid", "monitoring", "homelab", "graphql", "docker", "virtualization"],