ci: add Tessl skill review on SKILL.md changes (#74)

Use tesslio/skill-review to run tessl skill review on changed skills and
post results on the PR. No Tessl account required; only GITHUB_TOKEN.

Made-with: Cursor

Co-authored-by: rohan-tessl <rohan-tessl@users.noreply.github.com>

.github/workflows/skill-review.yml

@@ -0,0 +1,20 @@
+# Runs Tessl skill review on pull requests that touch any SKILL.md.
+# Posts (or updates) a single PR comment with scores and feedback.
+# See: https://github.com/tesslio/skill-review
+name: Tessl Skill Review
+
+on:
+  pull_request:
+    branches: [main]
+    paths:
+      - "**/SKILL.md"
+
+jobs:
+  review:
+    runs-on: ubuntu-latest
+    permissions:
+      pull-requests: write
+      contents: read
+    steps:
+      - uses: actions/checkout@v4
+      - uses: tesslio/skill-review@main