chore(ci): make skill-validation non-blocking temporarily

Until existing skills are updated to comply with SKILL-FORMAT.md,
the validation job should not block PRs.

Refs: #388

Author: mcj-coder

.github/workflows/ci.yml

@@ -45,6 +45,7 @@ jobs:
   skill-validation:
     name: Skill Structure Validation
     runs-on: ubuntu-latest
+    continue-on-error: true # TODO: Remove once skills comply with SKILL-FORMAT.md
     steps:
       - uses: actions/checkout@v4