fix(ci): explicitly instruct Claude to post PR comments

Add explicit instruction to use 'gh pr comment' command to post
reviews to the PR. Claude was performing reviews but not posting
them without this explicit direction.

Author: zealoushacker

.claude/commands/link-review.md

@@ -28,4 +28,4 @@ Provide a clear summary with:
 
 If all links look good, provide a brief confirmation.
 
-Format your response as a helpful PR review comment.
+**IMPORTANT: Post your review as a comment on the pull request using the gh pr comment command.**

.claude/commands/model-check.md

@@ -14,4 +14,6 @@ Then check:
 3. Flag any internal/non-public model names
 4. Suggest using aliases ending in -latest for better maintainability
 
-Provide clear, actionable feedback on any issues found.
+Provide clear, actionable feedback on any issues found.
+
+**IMPORTANT: Post your findings as a comment on the pull request using the gh pr comment command.**

.claude/commands/notebook-review.md

@@ -41,4 +41,4 @@ Provide a clear summary with:
 - ⚠️ Suggestions for improvement
 - ❌ Critical issues that must be fixed
 
-Format your response as a helpful PR review comment.
+**IMPORTANT: Post your review as a comment on the pull request using the gh pr comment command.**