fix(ci): add allowed_tools to slash commands for PR commenting

Based on maintainer feedback, slash commands need allowed_tools
specified to enable PR commenting. Added gh pr tools for:
- gh pr comment: Post comments to PR
- gh pr diff: View PR diff
- gh pr view: View PR details

.claude/commands/link-review.md

@@ -1,4 +1,5 @@
 ---
+allowed_tools: Bash(gh pr comment:*),Bash(gh pr diff:*),Bash(gh pr view:*)
 description: Review links in changed files for quality and security issues
 ---
 

.claude/commands/model-check.md

@@ -1,4 +1,5 @@
 ---
+allowed_tools: Bash(gh pr comment:*),Bash(gh pr diff:*),Bash(gh pr view:*)
 description: Validate Claude model usage against current public models
 ---
 

.claude/commands/notebook-review.md

@@ -1,4 +1,5 @@
 ---
+allowed_tools: Bash(gh pr comment:*),Bash(gh pr diff:*),Bash(gh pr view:*)
 description: Comprehensive review of Jupyter notebooks and Python scripts
 ---